Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3433c722c3c1dfb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 10:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9b3f9ba5ac75843f008b0e566dad50a SHA-1: c1dfbf0a67223001bf62f07121f2d47cb3433f03 SHA-256: e3433c722c3c1dfb492b13326479a7071b68a60f92adea6ba61eb1fbf76e7723
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially compromised websites, many of which host further PDF files. This suggests a link farm designed to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=teachers+guide+english+10+pdf PDF link annotation
    • http://akkoryazilim.com/userfiles/file/dekalololetalelo.pdfIn PDF document text
    • http://alkanboya.com/files/file///57459631685.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d105e7ae---ginizegogikokuj.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a2a688be2fdc17070b2bc99101ec8008/gedarugeg.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/98937209727.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/63306edc02b6d98a0fa471b5d5b22a90/wutelorivuvojinamix.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/poxodipu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097bcadb7999---vokomofogexuza.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd83cf0af8d---kokidabuzitijig.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161253898697eb---pojowakesil.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16102ccc2b4606---zuseregukeko.pdfPDF link annotation
    • http://harrisonfamilyreunion.org/clients/868801/File/vaxetimudedofuvirirepobod.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087572d446b6---wokemugukifigewoxufezeze.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/mubekixisogi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/84095616737.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/r36r1k6n8abup6oc9dpaje7rqg/punawufajim.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/71363403461.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/69582085338.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/62287891745.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/niwokegivonodob.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c217a32e3---70546812440.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3d3523db---xirorepugomipiliguwigaxaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 20068 bytes
SHA-256: e5a21208a9186cc8c98e5fbba53374f842047246d240be5d2aa786d8101987a3
font_01_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 10916 bytes
SHA-256: 996535109b9de76666f823558d39c4fe99147ce19e91578fe5f768f83f2dd37b
font_02_sfnt_off00012f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1