Malicious PDF — malware analysis report

Static analysis result for SHA-256 c576cd6d94aed446…

MALICIOUS

PDF

72.7 KB Created: 2021-06-15 18:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ec2af62b3542f1e7ba461b21c3f31a5 SHA-1: 930d3e411897416fd86743516f189d2d90ed8254 SHA-256: c576cd6d94aed44697f64eb390dcefa35cacbe04a606a4e5320bebdf04d061e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'chess openings for beginners' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=51+chess+openings+for+beginners
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bn06414l9f5eajp4ujvnl5rag6/faladajejanol.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/89e40f456d06795212cb93398763a65b/fogomazewapezigur.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee4db0561---19257331387.pdf
    • http://softwarefactory.nl/images/file/78843399653.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/5505d9bb4814866b42e6a7ad4b433e9f/diguzakijuwigomurug.pdf
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/nuvupajij.pdf
    • https://thinkhigh-tech.com/d/files/tilovezojuwexibesobopi.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/soqekp3uu0d33dfjmi3angt824/manedufufuwugekuvuva.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c895d0135c9---67894499813.pdf
    • https://sasalidayanisma.org/uploads/file/80464084992.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/14e3e73029041228701b7500864e01e4/33066392642.pdf
    • https://mldom.xyz/web/img/podborky/files/gugufesujebolozozudaz.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4e7b1e31---70288456581.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf70be2efb---gamizofewofav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de95.bin
89938270b490537cd9bf7b924353bb9d01c53a9eda18291640c56b49a8ce3d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5256 bytes
font_01_sfnt_off0000f07f.bin
737154a3782da11f0dd66b70486a4ecef591bfd17bc6b6327e9f5777c3b4995d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 11048 bytes

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