Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3f9b6d72592bac…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 20:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3733a8544f517223064d94f1dff2e062 SHA-1: 5986c04191ac7064052f90d9a7280bb3d9acbddd SHA-256: 4d3f9b6d72592bac8fe82d8a5f7c57c2212b50e7a72031ad587de4d8a53c6c93
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of 'utm_term' parameters and the overall structure indicate SEO manipulation for traffic redirection. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the link farm nature strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=ros+cheat+new+update PDF link annotation
    • https://hotlinepro.in/admin/userfiles/file/fupogojatuzisosemawis.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/98857035887.pdfIn PDF document text
    • http://princeverma.in/uploads/files/80340911381.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161445a4f713de---bekazojo.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/2307654197.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631304139.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902225848_cywhmk.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/rozikonoriwumumimi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135342c8cde1---72754893524.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/vumuguxuw.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/1630080429.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/45216281799.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/99382575897.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/jejixitilapuferenakiget.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/xugibuvodelagijusovi.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/revezesoxuzopusuwupa.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/xiresesaritegug.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/voxabogiwapipuk.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/88846638734.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614245d22a324---69827741253.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/53279292870.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/mokediku.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xowinifab.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/63676385076.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c65f29f9a---radifamixoviteg.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 18056 bytes
SHA-256: 98872e6e5995dfcf0b3d66b0f14c878a620b29e68b2ad85cdf40b4ea34e80e5e
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 10604 bytes
SHA-256: acfc061a35921adaa1628a85cdabaecdc650955740e0f1789b4dfa813aeebfec

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