Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6a9de13ec434cd…

MALICIOUS

PDF

96.2 KB Created: 2021-07-14 00:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 436622622bfe441e3dc73ca886a37000 SHA-1: c691cfd05bfd81c1bc23f32396b7d3fee0b04624 SHA-256: fd6a9de13ec434cd9c231c94aaf752ff6400dc880be67c6ca12ce134e2a42a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=chicken+marsala+with+tomatoes
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/9k9qh06dq70fe66or317fbcp04/91794957461.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825d399907---34377520107.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/40a2b7273970f7ceaa63548fdef636d5/geziweguxiresojetivupo.pdf
    • http://adabaskimerkezi.com/upload/file/zasuvone.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852856efa5d---76128282825.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l2g5p35uas2v81lodqimvl1nj0/35509668856.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/87476b9bec32c5657967c38e99568f35/42435138312.pdf
    • http://chromoink.com/updates/file/24366576090.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/h3bre8bophcb16pevg6hkag98j/kesatimarivelefama.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d4d3e9dd54dc51921fa2e64c83e49d91/15147747260.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88851874cd.pdf
    • http://capmar.eu/userfiles/file/15951535337.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/97100465439.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d286136b---93341539542.pdf
    • http://lapenya.cat/imgjovesnaves/file/nuvelewanosazeviref.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/71dfea51dde5fc5b9942b088ac976fc3/99825597776.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160898c4874110---20284816878.pdf
    • http://pogservice.ru/userfiles/file/86568606614.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2372a50a1---48177528447.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c5816552c---77012287151.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hi15hvgmkjlr9jk9erisq133h4/revefujufojewune.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41806a0a9---malogegar.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4425e9bd7---kenokom.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a3ae13c89841b4ce297a7942b8518560/jowugiregop.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/976beaf24e3a393cee6a7fa99901261e/52679628654.pdf
    • http://bdn10.cz/files/file/11380367869.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04b.bin
3dfbe64711c8de5407b329e7e3ca5ff5417905bc2ebbc93f6e9e85123ed4cbbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10704 bytes
font_01_sfnt_off000108c3.bin
6d67d227bb877b83698d0f27b67dbb46ed78c1e6aa0c3ac9eb38b1797d84ef6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 18344 bytes
font_02_sfnt_off00013868.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 1824 bytes
font_03_sfnt_off000140f4.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 16684 bytes
font_04_sfnt_off00015891.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15891 16792 bytes

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