Malicious PDF — malware analysis report

Static analysis result for SHA-256 444ab1994b3861fe…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 07:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a17b3eee67fcb46b10cd24f78a1e1edd SHA-1: dd67d33a483ce1e9aed23e82472c8399f2ed34e1 SHA-256: 444ab1994b3861fe1f71dbc925f8bfb9a6a7670df33ca460299e521a667edc68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 5

  • 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
  • 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://rund.cz/UserFiles/File/80623594582.pdf In PDF document text
    • http://zlato-invest.cz/upload/files/patatatusagotapunurirovo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/v0iagbadao8dh9f9do1qqcued6/15482807667.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/josakutopu.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/wubegizamilojigez.pdfIn PDF document text
    • http://mextro.de/upload/files/dekatumamaliloxog.pdfIn PDF document text
    • https://securitydm.com/slicice/file/gafegusukalajafetoladumed.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f04cdd353---xixawijil.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/62267159875.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123cebdf0587---terurotaboxa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1ac13fd4d71b5478f51ed382d0e7b630/58353747809.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6481aa430---12391532238.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/fuvazunamufidepe.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8ffa230a9ac40e7f630db6df887537f0/gilukibadazasid.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/laxavewinofazupizu.pdfIn PDF document text
    • http://euro-ex.com/fobomadizizete.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/df3b65aef9ea288aef0ebf6fc81d2ba9/jitixanuwukax.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/siwonekipefeturozuvo.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/46081700600.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zekobutopanime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=h+264+dvr+firmware+upgrade+tool+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 18860 bytes
SHA-256: bd0000a8d7443949cb0f51dfe2f8c01f77ef271b5892fb4c781c1c482b84295f

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