Malicious PDF — malware analysis report

Static analysis result for SHA-256 b048fc91bb9c4414…

MALICIOUS

PDF

440.1 KB Created: 2021-06-29 03:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6240851820149001d7412b5110044783 SHA-1: d674376cf602797e5fac4b7b672f94ee86f9f579 SHA-256: b048fc91bb9c44148b50798aedd71ff748d07464f3acf7c71f74f3dac3af5bb6
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The presence of embedded PDFs with suspicious findings suggests a multi-stage attack, likely involving JavaScript execution to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0186

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=eurotherm+chessell+6100e+manual PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79bc77e71---77841292565.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5a5cc923d4cbf293e994a5d5601afc27/sozisilaradetodufa.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/xaredivumow.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ddi8m3nqdutqtkmarv647qglt/jedubaterixelevobevizim.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0dedacc4f---21202643764.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a964d042a08---duxosirawon.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857639b6641---77496427093.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/njfupdvebt3u65hc6tmne4jf6a/fetej.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/05b1c509413917f70cab805000aaac5b/9524034508.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ec0bbc2b---5975592789.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/91470120902.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/wabidew.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0pt4h7hnb005k0qbrsu28qf7ms/rekoligejobakegudiboruzir.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/30366906067.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/pemosokedole.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/34589f3bb8b011f76150783c61d8018a/lukepukexowifetetoranar.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2ip5p0s9bo27lothm0n0hh2gks/95954989961.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9beoahehv1pv94vbrjoggt51h5/61039150110.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3093753e2---tavapidava.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/zimunasodexesuribura.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/dabupegi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8d5e93adcd5f9efa922fa930951492d3/bazoteropegasejo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 15760 bytes
SHA-256: d36a5bb46d9801e11bd8856694525c016b6e09f1e9b306a99d63a86feb9155d3
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10828 bytes
SHA-256: 530357dd581d412954ddfd6a9f27e608f33066446ed8bde02caaa691839bdd26
font_02_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
polyglot_child_pdf_off0001253a.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1253A 375549 bytes
SHA-256: 56eaf3953709b5472296816a10c48e3a142e3883b79edf95ae9597f71b9dbd61
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off00024a74.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x24A74 300483 bytes
SHA-256: a2014834cadc531e06c9d34b9be72378000d83c038c895ba1c9d31cdd26aa7bd
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off00036fae.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x36FAE 225417 bytes
SHA-256: a19bf06a2ca519446be20c4d9dbede2d499adeac6a1142d746090a8c2589d481
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off000494e8.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x494E8 150351 bytes
SHA-256: 578e222117d9292c405c0be3a8136e2bd5320ed26399e077a19cf19620b836b7
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely

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