Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a72d1785b2a9c3…

MALICIOUS

PDF

72.3 KB Created: 2021-06-15 11:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57e08694565dbdbcaaccc39a5404ff2 SHA-1: 1c22726a09f03a4b0065019009b54f7f97c54b43 SHA-256: 08a72d1785b2a9c356d6c8e0340fda6e67ee6eb26a9cf952bac0cfeaee7aed07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=libertango+flute+pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81fc371aa---7948351467.pdf
    • https://alshaabcoop.com/userfiles/file/97582993664.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p8tt8ii95jlndui5l4d6j5iqp5/zogawakuk.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ed72229cbe47b6abef236845eaa5c71b/56332824551.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978c096e7---bulatefinizujisewuboj.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca3b09d99d---24236134550.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4869b3ba0---64740320687.pdf
    • http://1careglobal.com/upload/files/84775668849.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ec436416---ketipalapikunolafe.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489c34d94d---sunogovawefavigodiw.pdf
    • http://naturallabs.de/userfiles/file/97326122292.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/72fef8fcffff3b3b24f20e1dd1bdaa69/gataxupos.pdf
    • http://asckhn.com/acskhn/userfiles/file/tesurub.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942bbb680fe---47152997705.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9395daa1a69693bf669b2e500b508eec/61911372931.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_off0000dac2.bin
5fab31867e8d1c5ea1853cde3f01e28877b9de32d4ee3af7c8232e9ca9b1dace		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 5112 bytes
font_01_sfnt_off0000ec3a.bin
78ae5a9fb9f422c3f96cf11540f277104342d8c2bb86e0e4c3f14bb28cb19745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 12096 bytes

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