Malicious PDF — malware analysis report

Static analysis result for SHA-256 976233e7a0354045…

MALICIOUS

PDF

79.1 KB Created: 2021-06-28 03:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e0c740fa42309727c337b45c11e0689 SHA-1: 3b366f400d485df55c0a1d1c6bbcbfd1a3edfbef SHA-256: 976233e7a03540453bb74b907d455fb200ff7dc4d7c1b31f05c8344bf6936b61
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis point to a common tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=midway+exposed+aggregate
    • http://bajajsports.com/userfiles/file/kewopupibataroderal.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b290bc39bab---rupurakiwekovofog.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80de4fe510cf881a4c414148a2ee29de/30275220161.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb958932a---lilunekov.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf34e64d2f---fogajozinajilezawelura.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094a15b91165---buteratakutogemareri.pdf
    • http://augustaelectricalwork.com/editorData/file/nigek.pdf
    • https://gregor-biffiger.ch/userfiles/file/34590897866.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/de7098904fbccc3acfc189adb82c6cf2/59365460186.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5ee1dc56---66929324859.pdf
    • http://edu-family72.ru/content/images/uploads/file/febif.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hhpt3bu0n4780to8c91hf3snv0/90067925463.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71cee74923---ximavimo.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0dacd692e---18265850504.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16087f11cd4ade---lowuzudedafekolel.pdf
    • http://csc0311.com/userfiles/file/20210617170636_r49hxr.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7b07afc9---63683335842.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ebeabc454d400c78f986f5d259b33f55/gesametewuw.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pll9j11644km7qrq849l22jql1/12134076164.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a5a8qm7aeajph1o091p0sh43vp/wolawatemujimepix.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c2d8c0793f9b71f6eb24a2a698052ffb/rupimivef.pdf
    • http://davidlbrooks.com/clients/868292/File/fikiguvatijupinu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5cc1b77d52822968ede519c6faa0849/tufupabuzuduliturinisepo.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39f4858af---sizeranagapixakufubagel.pdf
    • 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_off0000d37d.bin
8c738c0d7f77cc8a42009bb39a412f18d72e0a11b4766c79b752253f31736c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 16660 bytes
font_01_sfnt_off0000fe96.bin
d5acb93fe58d1d4d86aa064928af671c0cd1cf5c1b9e39a744987340cf136e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10712 bytes
font_02_sfnt_off00011739.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 16792 bytes

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