Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d195cf40ba602e…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 10:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 72e91289f2ba44f7a51b8bd6804c42f2 SHA-1: fbf5231b96b403ccabdac66c1a1e5d54402f140d SHA-256: e4d195cf40ba602e02a9cb9bff80d7a0a0f81d91de2015759f59ac66323a3fca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external PDF files hosted on various domains, suggesting it is used to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://dinskayarealty.ru/media/file/sefujimov.pdf In PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f2569870a7cd0f335d9350b754af54bd/pebojasel.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/jaragajabujajisomajawin.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d9d9a6bf59172e8c52ba419efca4784d/femifisopuw.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607951e5d31fd---91370252299.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc524dd5b---52484785956.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab77aef1dd---66233462892.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0l9966fgqmm8i13v2cr04uo4g8/7122165446.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/22704683028.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74651f33fe9e337dfd9670bafeef42ff/58956781855.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/tezelaxuduvaxuvunu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/50248959396.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/mojafewomoliweka.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/71065255671.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/37739214031.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099abaf24a23---mudad.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/17352316519.pdfIn PDF document text
    • https://ijpdua.com/contents//files/tobevixipodawivogavutafej.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5d7551cf---pasozosuzifan.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fenurowovakaw.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/terudike.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbda34bdc---92818740879.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/22097471535.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcab06db2---38489111398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+effective+is+birth+control+pillsPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10700 bytes
SHA-256: 65bb136cfc4622540d6d532569c22b5200a22763e3c8a95805e0f2d796e78271
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 16972 bytes
SHA-256: 22a74629b0b0ece133bb40dfe2f50c1b91c95f2eb62dd5429e2bb61bde8dafa1