Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f0f1ab42560d7…

MALICIOUS

PDF

179.9 KB Created: 2021-06-25 14:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 861fb5a267cc88d48bf7da55626c6eb9 SHA-1: d462419d47918e0077627ff66c5cb03f229ea168 SHA-256: 607f0f1ab42560d730fdeec78fa1b2cf0df726d90fd63e2c2f3684f0a85667a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. The document body is unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=biochemistry+exam+questions+and+answers+pdf
    • http://anupbolivia.com/images/files/zenifanoxepodeguselabe.pdf
    • http://dentherapia.hu/files/file/58140318453.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/3e5b502e60507474b85510d1a22e2754/10508281096.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a9d7c54d62b93c4b54cdcd08b85ce6dd/fuxum.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4bde9886---17387107909.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a7eca00f---13944440902.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1igedrpsglvan1girp7j6peig8/suzilutuxebatin.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6e7c6e1a---68581305429.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0d74f14ccd5b068eb3634d664966a772/libavixakigeni.pdf
    • https://medtek.vn/storage/file/zipagoporivusofat.pdf
    • http://z-i-f.ru/userfiles/file/77361756347.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609484cdc5241---rijexarividepawegitataza.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87523210371.pdf
    • http://buchtel1967.com/clients/26382/File/96279836629.pdf
    • http://ekolojikweb.net/upld/userfiles/file/1822332611.pdf
    • 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_off00025c56.bin
e923f02b4a291f2547c248f3cccfc02ee298837e54618d475a85785d958517cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25C56 19108 bytes
font_01_sfnt_off00028fa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28FA1 16792 bytes
font_02_sfnt_off0002a7b8.bin
8d090be4c431ec34e6d435deba27d379b5cebe59d61875f613f8b19c0f379fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7B8 11440 bytes

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