Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c96025abf45355b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 08:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8dbaebc46eb0237f1665d54f63df8f0 SHA-1: 6dd882acdcb71d0f54d6143c07d109e791989655 SHA-256: 8c96025abf45355b34ad89081179109b89d10333ab3baf97a9775c6d6d4785dc
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious PDF files. The primary purpose appears to be directing users to external, untrusted resources, which is a common tactic for phishing campaigns or initial stages of malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7118

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=things+to+build+on+minecraft PDF link annotation
    • http://coimbrasoftware.hu/images/uploads/files/riridakego.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/32479350217.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70b25b4a4---sofofofapopinobirasigopi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/bikozidamod.pdfIn PDF document text
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.pdfIn PDF document text
    • http://mgrima.com/files/file/99066872450.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659bc946c---6304244023.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5623ac5c7995a7d014e95451f4655b64/67874987941.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/37810381545.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/32545618627.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/92952009730.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109021015265677.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc48510ad4---wopatexetudodegu.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/97188399336.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32a10bb65---91328697568.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/pujanox.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/71336092784.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/fewukokufefirejej.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a753e3838f---sozirupen.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/66348502228.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/nofutisis.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109082008419444.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 11128 bytes
SHA-256: 18a6744c09b3621a803d436c59dcf8ce4cfd2e06452941144bd1d049347b0e81
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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