Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4709afd9218c0f6…

MALICIOUS

PDF

104.4 KB Created: 2021-06-30 08:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cdf304471f46ec2eb635d03aaa5cf33 SHA-1: 0cfe8b92bcad6165ff1530240ffb0e8cce043c19 SHA-256: a4709afd9218c0f6df7eb97501442b422dcdd33f808b6f75d4f4713ff7f25e55
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. These links are likely intended to redirect users to malicious or spam content, potentially for SEO manipulation or to serve further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160764e058c04a---taxurixomim.pdf
    • https://triosms.com/userfiles/file/10297529038.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4a6596bf9896ee366e7d17b4368db81b/tuzipevabexuxivomowasadu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q6h30h5tn2ott7e6oh0vjpiaj4/kegusumaguluxexixokiri.pdf
    • http://langeline.com/ckeditor/upload/files/94262960375.pdf
    • http://afghansolar.com/userfiles/file/3680569755.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b438d6bce46ee2281b254bd058f8e294/wobojalis.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75fd69c74---nuxokevunewumokusakekig.pdf
    • https://eyetracking.pl/userfiles/file/82248144969.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/589038533d7d644123493a389877e023/25198456559.pdf
    • https://gyandeepjkss.org/userfiles/file/fajokuzulutorukojewogigo.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934236cf2b---vetudifuzene.pdf
    • https://abe-rdc.com/userfiles/file/23767545265.pdf
    • http://synowka.pl/galeria/file/6119309263.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7084e6d89b---giwiruliwaxuwid.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0e2ea193---jazev.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/59q91pta1dlsg9l3s9cc4aau5d/kuzudegabutorap.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/151598986.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d3f773c917f92989a71886db929be22d/49535251308.pdf
    • http://artospace.com/pics/file/33842436412.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/s6rj9g5gfej9cpsqju8e5qt7s7/gigafir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=logical+fallacy+website
    • 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_off00013506.bin
ad09316b004cab82c73ce521ae034b47ac14aef9174c6a7d08ecb6037293ae86
pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 10604 bytes
font_01_sfnt_off00014d7e.bin
1a1304fe875371ebfd7216d18cb0706a67124a9dca346b0cadaaf361ba19abdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7E 17780 bytes
font_02_sfnt_off00017c4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C4E 16792 bytes