Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0490abf77cafd9…

MALICIOUS

PDF

79.4 KB Created: 2021-08-19 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b53a978acae0024ef5b309b28a7590b6 SHA-1: c685ff02eaf2366f3f3d83c08202a8d423eae279 SHA-256: ca0490abf77cafd9839b73a8705d83c9fdf4bd64e33e887e840bc552e6268eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=f%C3%ADsica+general+serie+schaum+pdf+gratis PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f2c0f88c---49409950039.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/ditolizakotozituzor.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b2652a98---toxeme.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wesazupunejitoxi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608251f02ed88---64056949882.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wavukajagojifixikabebora.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/padareluvawivaku.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5b8162fa---pewiwul.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d0d4d170---9918196274.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/164400919160fa79c149401.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/binonujola.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/62873762575.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/vutipuvovuvivi.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/59534166640738b7da54dbdba90b70d8/46232243250.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/41680698377.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/fuwosutetevu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/798430f57ead8a9b32a55dc409ad7054/jolas.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/midumawuvolukavadujibeji.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/volimeko.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/52744554971.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9e00d9f3---42975591015.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/14126535671.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/59624686105.pdfIn PDF document text
    • http://geose.ru/userfiles/file/11096489136.pdfIn PDF document text
    • https://izr.fr/files/63340001588.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_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 16872 bytes
SHA-256: 2187b508fdcb6f13bedd24b8590ff401206e3b18b82cf2b3e07b2bb272e75587
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 11088 bytes
SHA-256: 6f9e17cf2ee6e0c9983898425371e1a97ec620652d5072e6fa3ff3d5026c4a96

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