Malicious PDF — malware analysis report

Static analysis result for SHA-256 134c90604a6a2afb…

MALICIOUS

PDF

91.7 KB Created: 2021-08-01 16:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 792b690a92251b480eeaa5dadfc00c97 SHA-1: 12d3e048d8657829dd12bcd152c37b270e77ce0a SHA-256: 134c90604a6a2afb5a228ea6ec19db64d00cbe904f865a0be06e76751a5da001
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for SEO poisoning or distributing malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs, many hosted on compromised CMS uploads, supports this assessment. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b595e59843edf2347eabb457f080560f/kejulejudejisuxijaso.pdf In PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/87l0tp7uiakd9q8lm9l1go9di7/tutikatugerodur.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/7654654216.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b8n4cb8arrqim6nm0j23ta8gl7/15695880491.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii3or4lq1r73sh4t33ig0sgf69/funovoridadeguvelodis.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ijibqveqqiglqugbhrdfdcof4/49551202865.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/88664845134.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/19199362800.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/lutaxopesologoratu.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/tupifejuposopuzi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/463bd824274c8eca1d40b07ae9e0bad3/rofip.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea4738e45---kixunemures.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/puganeleluf.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dda79327c0e---tiziwexewixubota.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/xuzirezunokamatitobe.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/jezegijofusaradedibip.pdfIn PDF document text
    • http://esejsc.com/upload/files/ripugujofitifolukosa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9009283f7---julerabugenatopetive.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ecc4e30b6---jebabogaw.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16270198661969504711.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/612mrsvv1mvcsktg27cd732gc7/gagovasesejukebide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+examples+of+norm+referenced+testsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 17500 bytes
SHA-256: dea76f80cbb4003f0c7bf51513df66a98bab78c85316ab61d82a28e88ccdf9d8
font_01_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 10888 bytes
SHA-256: 54baef37ca8374de35c042fdbf152e263718fe57714c1165a700303f54d83267
font_02_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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