Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd80df49163104a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 21:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdea0423521785b4a1cbaeeaf54082a9 SHA-1: 1973baa3afcc4b44824195f2c341fcee2ac71a3d SHA-256: 4fd80df49163104a6a0e54dae5c3497eed509a550df397fc9f8f45bf21ff6f59
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=isuzu+4hk1+engine+manual+free+download PDF link annotation
    • https://cam-ceeds.org/ckfinder/userfiles/files/46646412681.pdfIn PDF document text
    • https://seikico.net/img-tym/files/kojorug.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/44918925494.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kilifazesogima.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qjpa7qeco75stc2o6u27u3khq1/filezabokevototunaf.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/fevexogo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/88600075791.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fd291ec1f---nizapagisobabusumaw.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cd4ff7983377b0884f9d286d3c849004/90997102507.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416dfa9236---xureli.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/gipaxezogazaluduli.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/bugijuru.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160761afb45a2b---84757415360.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210802_487BA8B01F856746.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4f162e85d9b1f709d77d478076f58f40/fazugekefifaga.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d8768a88d---xufubovojuludebexen.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/pijosomi.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/1047971497.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c917c116a24---370206623.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nkq5rfdmo7362fmgootpi5aakl/mapajiki.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160893cb6e0f6f---zedubawi.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/dujeduxe.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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 19088 bytes
SHA-256: 6cec799773224e348a4a57758f3c0f1928b4bfbfd788454e90cbb1efe6e4234a
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 11124 bytes
SHA-256: e1d076f6b0345a3d1faf1ec1911ad5f1b0c7343557e58fb55502e350e313ca7a

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