Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46c4d40456a5c5e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 08:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f54d4aa2c1b60917967366462f435283 SHA-1: b4eec479f3e4d6a52bb62403a68c8efe1921a5aa SHA-256: c46c4d40456a5c5eddd5e8d45bd594e47a575b598b144df780906527125df7e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=chemical+thermodynamics+pdf+class+11 PDF link annotation
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/rorogurevomeromafe.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xikifumiv.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0720748af1---vosobabenuvanema.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280435528126.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/15845564085.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/632771610.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/88bb081d3108f8b96d291d2d694571ad/titedatojozuje.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/zogozesetono.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/boxogim.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/4420131326.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/nisufawabepotukakalo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e259c328832---10373639751.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4872eab0---dejedoduxubexawixeso.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/14117490910.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/balikowumuf.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1f22780885a1494acd449753c1706b91/2114715201.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/xemotakujititasil.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8891933a09---13018508220.pdfIn PDF document text
    • http://sivam.pl/files/file/54779758481.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/47165539758.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4a7e3d564c678001bc6fb80c2edba8ef/78492579047.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fc72aacb1---govejisupemep.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/52254898637.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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 11084 bytes
SHA-256: fe9fee741942ec4735f2959e017fea56dbbc558bcb1ea7b83fe44b619b5f5fa3
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 18596 bytes
SHA-256: 42783b9d4e59e2072a4716823e63adfb6a54627e9cd2f39c522d52ba146d8324
font_02_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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