Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4a4cc942b8452…

MALICIOUS

PDF

96.6 KB Created: 2021-07-02 05:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22803804ccb9d9b9dec4bd7427943d1a SHA-1: bb900a88515ad3b83020979c92f42a42e541909a SHA-256: 8ff4a4cc942b8452f5fe0a06527dff898f0a308bec7543f1ac21e2576f4c07dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive means, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=i+never+dream+that+i+need+somebody+like+you
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/q3alc00etgulm3q1u7jqtk4v2r/89360175217.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5b92a6c4b70995e61d6f74f4f44361b9/87175144355.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/zatonenutugebuwogiw.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2ca1d6042---ditali.pdf
    • http://asesorgubernamental.com/images/file/21454782940.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/43faa7c9c6e8d50228d819b81b0a30fa/91062862605.pdf
    • http://sacmacbook.net/userfiles/file/rinikunutelapi.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d916dcf56---fuvujasovusofuk.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a166af2d3b9---gigikanomutu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eiqshb9h77af2qejnal09l9srl/kelabojerulad.pdf
    • https://implant-drill.com/userfiles/file/kinazukasaxafovedon.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/akq9kcb42iq4kb0dpduu3ndu31/mememururibo.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/932a25207a93759e1af914ef434e17c6/29259334737.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qde3mo37m955rnh7s556oa4f26/wujufusaxofusirusozowat.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tf7m9019r38vlch7ch6nhnrs5/53152093517.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_off000114b7.bin
f24b674807fa3f8768e37a3ad750e6b825cdcada48e24ddc9a104fc3dc4d3ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 17564 bytes
font_01_sfnt_off00014255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14255 16792 bytes
font_02_sfnt_off00015a6c.bin
22ec7060f27deb45d32d06c588201b531ce5931b221f21b53839d4d601456033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6C 10976 bytes

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