Malicious PDF — malware analysis report

Static analysis result for SHA-256 838e131b82ef9469…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 18:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 477bff2e7e6403a1b274970d77ab3728 SHA-1: 80d35168b3589328bfc7a1072d86082c35966864 SHA-256: 838e131b82ef9469cac90d607b94449be0574c3bc12c589564d5bcd750f5e9bb
156 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, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/000c4389dc55ed0117079d78bcaa83ed/forulimobulaxagotomerugor.pdf
    • http://pphu-joanna.pl/fckpliki/file/98101525272.pdf
    • http://www.bash.cl/media/file/suwigipadenorinoxibazo.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1d4e8e0a67adef8ee7278fc0b260697c/19605883930.pdf
    • http://artkulinaria.pl/sites/default/files/file/89170934407.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac825f8d0---xifetekowuzibuji.pdf
    • https://raiporjai.com/piceditor/file/33544322868.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869951c7204---49328794174.pdf
    • http://ilyxrace.com/userfiles/files/wofefajodabud.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/489eed3f27269e7691c526bbbe75e9cc/nejaxofotokas.pdf
    • http://lagunaapartman.hu/images/user/file/nodupogelozakafopoxix.pdf
    • http://acecaalcoy.com/userfiles/file/mifeveripukuxomujej.pdf
    • http://zulaikhatextile.com/userfiles/files/xaramexenuber.pdf
    • http://cablexconsulting.com/Upload/file/15004427609.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4701de43912b65067d410296ed413642/54845054354.pdf
    • http://vistobrasil.net/uploads/file/zexojanirewesipixomuw.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4e95f98f---venab.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1a84da0d---zakuxaxisabaxadep.pdf
    • http://robwalker.net/fckupload/file/56362327818.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab785e83e18---9592771162.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wealth+of+nations+capitalism
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d1.bin
69bfa4593831161d611215b2239f398e7988a94d7eebfb315f5d804e3d11f618
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 17180 bytes
font_01_sfnt_off000126ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 16792 bytes
font_02_sfnt_off00013ee5.bin
d01eba278b9258d559ef3cfa985f2dc8192adaa6a10148509c0ca2b29ac36147
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE5 10640 bytes