Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ec30fc1e989bb1…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 11:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a94f2fe42a774babfefefdc03d617c5 SHA-1: f00f5f70793fd37786bb451bdb3198fc4b4848b0 SHA-256: d4ec30fc1e989bb15a1978bcadc9864788116185100a98bd04f5ecc90dcc3255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering further malware or leading users to phishing sites. The document's structure as a link farm is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.asslar.de/downloads/bazofodoluxuwuzipixafexi.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87068124742.pdf
    • https://erdemlerkoleji.com/resimler/files/57738103720.pdf
    • http://baloneacessorios.com/_upload/file///76124924196.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4cafcdf66d44a9a5c35a395917cb182c/96052632134.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca157199b2---vasadefaxeramofewiz.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160897c575a06f---10951011484.pdf
    • http://myphamhelios.vn/luutru/files/70243456360.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c09f7ae97c743480126cb9986da3c23e/benokobifibezonovir.pdf
    • http://asckhn.com/acskhn/userfiles/file/farebesetoditoxodo.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8657bec626bf0e2c6d322204d8819468/jogagufatelozufe.pdf
    • https://akproauto.com/nbloom/fckuploads/file/wexukovat.pdf
    • http://timandlor.com/userfiles/file/kopegitigikasupogesawarel.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t60k6puarbq91512v9vfmpoijv/rizuxi.pdf
    • https://ovth.ch/userfiles/files/87254100985.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64d078dae---92868986651.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qlbmvs2i0sme71iafj8s4klbvr/42799665545.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03008a19aaad50f6ffd13c537c8e4a98/marazesujenoguxigi.pdf
    • http://biomassasia.net/data_ed/userfiles/file/wavusapiberotuxibilarasi.pdf
    • http://dreamcatcherltd.com/userfiles/file/malevinoruwevuli.pdf
    • https://uniqrelation.com/userfiles/file/60483160968.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da27a7e8dfc---telarixiva.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/u6of7amjsh4ack4goc45sjhnjq/noside.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1300f84079d609590d180a3f88895896/jogamagerisarofumela.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=perfect+macros+for+fat+loss
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f227.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 16792 bytes
font_01_sfnt_off00010a3e.bin
2c12cad55e5334b90d91c0e50b8f2c6426e1551ff0e4d35077c071a54fcc0396
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 10300 bytes
font_02_sfnt_off00012188.bin
cde1b7fb9a3df5d9774385ffc94967c256942667bb49484837f1951a833eb859
pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 17540 bytes