Malicious PDF — malware analysis report

Static analysis result for SHA-256 6898e153dbe4c043…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 03:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1f46c10be93adfb86e8a9bad988a75a SHA-1: 90a1b815ab180c2078a9e694dcb569eba31ed64d SHA-256: 6898e153dbe4c043d8aae2b31d696478c430d8b2e76cd8a5e4fcf8b909495b89
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document's content, though heavily obfuscated in the provided excerpt, is associated with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The critical 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's intent is to trick the user into installing remote support software, which is a common tactic for gaining unauthorized access or delivering further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chcial.ru/uplcv?utm_term=what+is+my+native+canadian+spirit+animal PDF link annotation
    • http://xtra360.net/campannas/file/70663407616.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/serezi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/91559614118.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuxubi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/84206544885.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/78279831096.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/76776856966.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/93563813510.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/52034705135.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/5273498089.pdfIn PDF document text
    • http://benrassam.com/uploads/files/vulevuxagime.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a7989928---47448273589.pdfIn PDF document text
    • https://termofriz.rs//files/43360297519.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609154be69d6f---rexevunofitakem.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de43f68256---3779004471.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/18690018222.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3eb56dbe0cf53de24881c0f1285168eb/30985747902.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cab51bbf9cd4a9035978da54e5fe6957/41164949139.pdfIn PDF document text
    • https://bloc-immo.com/images/59251145908.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/pewig.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/prfn2ltb4ij5agl0gppf15e802/68580770105.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/dudatalakopawi.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/14179742982.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/63416795440.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10832 bytes
SHA-256: 852ac72689f07ab08bd4fe9f9b546f65d775f2d5a949b2e343e62d5294105cb5
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 16840 bytes
SHA-256: 65311143dc0fbdde28ce08c512e27695ea4af90b6b052576b1c5ad2c45be3ea6
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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