Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01648147fbd77fc…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 02:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92b3da216e4c9e69305d61a405a34cb6 SHA-1: 7c87361a2edb4ff912c7b02267de8f60dfe3e037 SHA-256: b01648147fbd77fc1fc2ab0f947e83988331ea5830d1dc595c0248a2f8e009d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan, supporting the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=neoclassicismo+arte+riassunto+pdf PDF link annotation
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607164b4094f4---74656145992.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/80119069454.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4f5daa4de97d8fb694781a8382d9c01e/78656064059.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ab693e14c8c---rutaperugosesozudukas.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/53958347962.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/73365508412.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/merewoxuxovipox.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/df79b694d24b9b4ef6c0d2b64f696ec7/27611533222.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/vibedesumaduxajuwawebeb.pdfIn PDF document text
    • https://kimcert.net/E/file/jufufatawemuwa.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/levulusoxibodoloxi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d54ae5e5ff67f19ae6cbe823ed145e56/vomizozasaw.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/98682327244.pdfIn PDF document text
    • https://goldenapp.net/file/donixemudurifuvasazovapoj.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2a172b58d23d4675b7d3c529be42f8df/vilewe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/rafalamogumiwowomelimawa.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/44471425828.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1d41ac8e---95635101559.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c9cf71e9720f0912e1b03c2a0d71779f/xewubifax.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff782cad0---30872777487.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/vudokigurofojupibiwu.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/93370173734.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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 10860 bytes
SHA-256: 7d6d0fad38cd314547bd5d6913565787ca8528cc5562e706cc767af5463d0f90
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 19712 bytes
SHA-256: 958adcb7654ec66b1998f67934fc2e37082649ec395dc5d2a66fe56d999bdfc1
font_02_sfnt_off00013c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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