Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d408b2941899bad…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 10:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e27fb3ed7bbf7ab4881186d82b3f6c4c SHA-1: 3be5f45f71f3cbf785dcd79c8e91f7dd4b13ed9a SHA-256: 1d408b2941899bad590089845898fbcacc99386436cb4863eedf4ff0ece79d51
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of external websites. Many of these URLs are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://laborke.ru/uplcv?utm_term=servo+motor+and+industrial+control+theory+pdf PDF link annotation
    • http://kolesnikov.pro/ckfinder/userfiles/files/31191393630.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727f6d7c57b---jawavalorexafofewiwi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8538b3bb3f2b5963c8a7ec720eddd8e7/gawamozimujug.pdfIn PDF document text
    • http://rsst77.ru/upload/files/bogobujanite.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd7cea109---pibuvolebologopegav.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebf170d35---vovakikedupeduvudob.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612995f074555---66223331746.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/jatetan.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/lanowatijisetaluwimot.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/60742793275.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/97635681071.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/93049861762.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e195eb6a83---gafuredakidudoxorem.pdfIn PDF document text
    • http://airzo.net/userData/board/file/fojewikufixativiluto.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/65428920985.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/ruvabozu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/da06c319ecdb1b61ac8eaa921d4e2258/73366190781.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab6d0c289---40384360988.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9u9pjnmofptv3svtp29oumq73r/piwemodekede.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vixixapa.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/95081115238.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/vokujiwonizavejedali.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_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 19568 bytes
SHA-256: b5162ca0a5252481d5aec545c748dc3ffc8495496df9c7edf1ba4dc73a14fb86
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A13 11240 bytes
SHA-256: c1e2ce979e9381419746178914cd6ab422de40c358a18c9fb74883b644fd207b

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