Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f792de9f9b17622…

MALICIOUS

PDF

90.5 KB Created: 2021-07-09 23:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c061aedc88ba869b8939dea451402d7f SHA-1: 94f3989ecaf806191f7fe5c22fff6f0eec7fc836 SHA-256: 4f792de9f9b17622904b87155807c99b83e56171822d4a43690b0cf28aa94b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of a link farm on numerous disposable domains, as identified by heuristics, suggests an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://ahcxdq.com/uploads/file/041356249676.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dctuhbh6qdl3bsmjrtl19g3ntd/53454760720.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/18712658176.pdf
    • http://bakoca.hu/files/file/19561821269.pdf
    • http://dailycan.com/userfiles/files/46612892135.pdf
    • http://utpcomp.ru/uploads/files/20894693436.pdf
    • https://kodcomputers.ro/2664/uploads/34442216279.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c273bbd4---18044745483.pdf
    • https://semineebrasov.ro/printuri-fi/files/40288770724.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c0b88926---96413838525.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1147a24b---17892817164.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c53adadj15pkeij5gmioumg1u5/jekapegazoregi.pdf
    • http://antonioruizabogados.es/userfiles/file/kadogokodofoditegegimot.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bg9fk2okggvnh19sun2ni9j5b6/12391018697.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/23022463249.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7b429d3a---simedipuzinogovaxop.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8s5lnqpehi33hmjuq3te91uim1/bokofoxi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160804338518a9---jalitasofe.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080562d86b5f---timukozobizex.pdf
    • https://mayphotocopydogia.com/upload/files/46044073549.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/spsnfpapckofspiamg101rm3l8/12271942209.pdf
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/23326093150.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9ef21271488bf53931ad4a429486fad5/19599452161.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533f8c3cec---jezilironebujudixabipizaj.pdf
    • https://machnik.net/ckfinder/userfiles/files/97898378022.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=canterbury+tales+middle+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb1.bin
6c6e90cfabfd213828cfa06289a76691441ae66c5d93dbdc99cbf5abf998f593
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 10960 bytes
font_01_sfnt_off000118bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 16792 bytes
font_02_sfnt_off000130cd.bin
7f3e33e8784a888a690b8dc7b4c1b68e9597f646e19080ac64eaa42287503022
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 16932 bytes