Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4c48fc790c7209…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 10:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7eca7f4401e2aa9553bb5176f7d11c8 SHA-1: 5f7d3f205209692ded8bd36836303f7a5f51e029 SHA-256: db4c48fc790c720913178ec65916102e6a10013feeeefb7df22c770f9d2d8256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=acls+book+2017+pdf+free PDF link annotation
    • http://web68s.com/upload/files/sefagokenubu.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/dagasafad.pdfIn PDF document text
    • http://heureka-cz.eu/files/77402532785.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/12300699398.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/59569490647.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e75c50b88---10320643539.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/75772757534.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/lotalebidoj.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f757989d98---91630720879.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/suwonagaxabogupedoxu.pdfIn PDF document text
    • http://flexa.cz/docs/file/35385469115.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pims9jo5lu5a8eqi0suifre6r6/31844946301.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/96908488725.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/85620869769.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acec700c5aa---27193150224.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be8e8f10f26d8964a72d746cc5507e65/winabosirenigexi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b1f31ccc---zerapezimotezifozaxatu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8e47f413df91e7b835b89d38e7209475/pemujafewuzoxinepitek.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/etkadco5luhk43v0tg3b6o6ohg/120427449.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/xabunevavuvak.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/44540079218.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/nafukexabubizoz.pdfIn PDF document text
    • http://momsystem.ru/public/file/bivunapukesojuwez.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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 18152 bytes
SHA-256: 9fa07deee13e892303565fb413748a9e609bd06a25eaa410a84eeefe31e69cab
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 10716 bytes
SHA-256: 0ffe5de37cc648ecece8d03d48196f0bebd1cc2227f001aa678b1c9d3f53cb5f
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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