Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a5edb5fdaf79af…

MALICIOUS

PDF

75.2 KB Created: 2021-07-17 09:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5009d697b622e22fc56c8e0d3811d2d6 SHA-1: a37d64a46c5bf6a49109bb170b53a7d87aa08cc9 SHA-256: 96a5edb5fdaf79af35e4ef84d285fa854c69738fc18699fa1dbca3e287502edd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosting other PDF files. Several heuristics indicate these are part of a link farm, with some links pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • 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://coytex.net//ckfinder/userfiles/files/tijivuzopawavibibivoj.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/635280a5faf308fa5876c49e507b09bf/95598326318.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bbb131ff8ea1939cc160c59c01155cb0/27012348486.pdf
    • http://orderleesushi.com/uploads/files/98347345189.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xikufijeguwekojijom.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1tobe0iicug1oslvjhh855ovm0/90793959650.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d0062288---22432216251.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/96647601942.pdf
    • http://eclickapps.in/userfiles/files/dunofodikakikufet.pdf
    • http://fygl.net/uploads/file/061243287774.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1f0bd5368f960b041644b85e49e8e2ce/xunizudoxemo.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/12494686926.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f67536d4---modetowu.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/7726852247.pdf
    • https://wfca-czech.cz/temp/userfiles/files/7937000159.pdf
    • http://gemculture.com/userfiles/file/nutadogafowexubudes.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d20c64699---zevavulujalezoliga.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db62fb751f---5754311952.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608615fc623db---59803149125.pdf
    • https://solidpractise.com/files/userfiles/file/dusadedis.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8a54c24e---gulorabosare.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=microsoft+office+2019+crack+download+windows+10
    • 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_off0000c30e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 16792 bytes
font_01_sfnt_off0000db25.bin
0464df5bd8d06c9d2b47d332935da2a0edefb4263f50fde82fd1094d6e817aba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 11100 bytes
font_02_sfnt_off0000f55b.bin
d55f5e1df4fec4a5e25cc93b69735c36ca8f74da832150e362f2625d244055c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16368 bytes