Malicious PDF — malware analysis report

Static analysis result for SHA-256 217d3f02175c1852…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 17:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f42aa2f87a772197e90fac004fef2d4 SHA-1: 33acbe38be53b2d90850ba20df73bf43ccbed31f SHA-256: 217d3f02175c18526329e69078d27202ed6233e3a3dffca2bbba8221856b6c6e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=epigenetic+gene+expression+and+regulation+pdf PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5f96d133---wojapagofanoxularubofo.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/kifidimebagadofi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/59c7152ca2895a064325186168efe038/54296242448.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/6517615267.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vojenali.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce7fe345d---panebofometiraruzaji.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/78140794152.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/30967120387.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611959039158f---nosadovotu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/neq0or9pd2fr137gf4aoanjd41/fafufazog.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9febf5e5---2270873107.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/41309539964.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/korakulagatobunujazopesu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160974ddfac7d7---16846386739.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/26mp9pjb13dtbj8bhup348d0rk/98847152310.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e155639c30---62674888935.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/metus.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161135da427d3b---28339525695.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/3040794850.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b4fdd3073---filufupabodif.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27e0a886a---34662954015.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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 17196 bytes
SHA-256: f2618f4652ba5b790ec7acd29c0dcead35d57a462e955ef4b9964625db498385
font_01_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 10980 bytes
SHA-256: ef9e1c47527b2eb8da907c3ff915f6a87ce35f66b293aeccf60b43f966b2de13
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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