Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c9b06d06f140d3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 20:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 152c219597bc7fea95a693694065227a SHA-1: a88a4d5c9f6f4f97c07fdfadd28f48ccd5565a8e SHA-256: 88c9b06d06f140d3bcd520fcc1ba507e1aac23ca4b6a661786aadc64871d4067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a pattern of hosting malicious content on numerous subdomains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=merge+pdf+files+online+fast PDF link annotation
    • http://pytextiles.com/userfiles/file/risekulupazavuvo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pifowefetolegepuruxawiba.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/23413720631.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954983dc3bb---bedalemimajonalavapusi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fc55371c---87335078895.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6d7203be1e31b1966976e424e3307729/13668082511.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac8725fc6---kabitogubi.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/84156501987.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627885531.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d3ccca98---vezebet.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaedd95dc---9470484737.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e01299b90f---pipasaf.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/tefaxivokiwoxidi.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/nukorujuxugozukepujivodi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa82e7078---vegag.pdfIn PDF document text
    • http://3asoft.vn/img/files/figerin.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/63106623947.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/852c6bfb3158bed792fbb89bf988de4f/rejukeverifeguzo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/xonagana.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe2468d37b1c633de30cd85ebb553cb2/kawutisedogeginu.pdfIn PDF document text
    • https://filetorme.com/upload/files/gimaxufenesabojop.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/bbd055eb8c776ff9ac0e313d9e6721c8/41411706737.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_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 16844 bytes
SHA-256: 88c025ab3e339e239a22234d38f0a5a983a8367f7d44b3c07567f6c6a84ce62b
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10668 bytes
SHA-256: f28e1c13a077d48921cf69f86b8cfb628e59e583417d3a2404a6fd078585119f

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