Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb79669a8c53d73…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 02:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5235767eb4c17fdc3e41ce6bffc0d507 SHA-1: edd10b1320654c11f090ac45be262aa75372d66f SHA-256: 9cb79669a8c53d733e1c45879dd1a807c6111ed16c57c5803b47961d68980dc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=memory+card+lock+software+for+android PDF link annotation
    • http://harrodsrentacar.com/public_html/userfiles/file/25793619643.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/69308481962.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/giwoduvozamoxigawaxo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/zigidigemo.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210909113729287.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/3401294825.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/13235195921.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9697fa8113bdacd4ad6235274778832/36407269462.pdfIn PDF document text
    • http://splogservice.ru/content/files/58161495214.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xerekixikawa.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/30814790334.pdfIn PDF document text
    • https://cardolf.ro/files/8395893503.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d2b6643be2f082a266d72b1dd4cf423c/20351474906.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/80662415888.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/vowopapugixolefikafunoza.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/61695671336.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/28104468892.pdfIn PDF document text
    • https://jensbrode.de/files/file/vademigikujipapo.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/lakujefogasakolex.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ecd9d6ae---pagirowolibadugev.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb694173fd---wikoxofemileturugeburaxi.pdfIn PDF document text
    • http://goldia.cz/data/file/xefezogipasotuvazo.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/gutijexulipek.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/8490518130.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/41cbaae078f7efbce933e0d69c7b4fe3/58374360902.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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 17580 bytes
SHA-256: 583e7e79680e62e08b3567ef0e69a51ba9501ae748537f7b8040869f8ee2ae4c
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10920 bytes
SHA-256: e95ae08718e6f019da969b43af340d4e6c13b2af7dafd6f200a1369e76f3a9d8
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1