Malicious PDF — malware analysis report

Static analysis result for SHA-256 221f8dad9c3247b8…

MALICIOUS

PDF

86.7 KB Created: 2021-08-16 08:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89d10304f5d372c406037c5a2bb9d275 SHA-1: e8951d48a74d831df5cfc752086d13b857847a3b SHA-256: 221f8dad9c3247b88f9c0a44cb76dfefa38b979304dd30d005b6e893db5ce129
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of embedded URLs and the nature of the heuristics strongly suggest it's designed to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://denkobarbell.com/_upload/files/xemakegijagek.pdf In PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/46374525569.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4470f7eec0---31843095110.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160acfa6878d5d---bewabuvivafagip.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sonaxukivenojegurisojawi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/cfgf3nl587ip62agqkk595h99n/72449269261.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4178b17b335e14f93c703c109b8c30eb/tumovejejejux.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/46cbac9a47f99b0d0279bd2efbfae2f1/pajiwerologo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0533dbdc7e---17255682219.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af19a27ec70---67087828780.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/049811533f0627b7da22a453b400c3d5/6714867142.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d2fc56cc---sejojukoju.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/vewulemuz.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f6b025f1---kigatigozixasupik.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e55a39840---36081365574.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ad57ddc049d13dd9bbc76ad54ef61c85/lomotetomorise.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb96979397---wamowejo.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/wegananafatera.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/55c7e06ef933aff765fa52611528ef6f/kabezenobojatizasog.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/82885325089.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/piporer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=assassin%27s+creed+3+save+game+location+windows+8.1PDF 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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 11376 bytes
SHA-256: 3298cfa2055abc3e4fc937aa47246397fb40cded4cf4146ba7e2fd47bd0e66a9
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16968 bytes
SHA-256: ca8bf6ffe3442a5938f82def1e9c3fe07ec231d3671d7fb259d90a80f9872cf0

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