Malicious PDF — malware analysis report

Static analysis result for SHA-256 260f874e7cb82781…

MALICIOUS

PDF

116.2 KB Created: 2021-07-02 00:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e1f669e1421792994f71628a5165b39 SHA-1: 7c9d1c9b92a20a8641f8eed06f228083c7fde976 SHA-256: 260f874e7cb82781102560bbcf80d1cc07a38d13cbd1dc1a310a7c6f14359885
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicated maliciousness, and the presence of these link farms suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/trkq57oj95o9rafhmicb67cbmu/40892345522.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160911e2720b00---61012798477.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4374b61dbb2682ed6bd64fb430cbdd99/najigelano.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/85245562679.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q84uuma913vm1esqjqr1qe17h3/dilajalenejudejof.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe907762f7---88803433798.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/03945a77edfe28e6367f57a434cca7fc/40396744770.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2d823cc7---36460445454.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qohb40jjv7ti4gdnpob75j6jn0/lulopufokabokaxitowiwija.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/cqk3b6h3ht7guoauqj0ivpb2c3/vakojalotudizuf.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad944698f19---26435166136.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/72abb9f40941913ae47a4c3e1658b965/veluvutaburim.pdf
    • http://marthomaiticherukole.com/userfiles/file/44433424503.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094098db803d---67678049812.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/84ca275149cc787df61b997dd83c2cd5/duwumesipigadesi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e35409c0---17911735064.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c85e50280---zuzabizopamati.pdf
    • http://geologicatoscana.eu/userfiles/files/14444763427.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c83d6463---fiwelovopuzitasez.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98fecfc4f---85702462352.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe2fb1a37---gozesanagadu.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210616003254.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/c8508e53000c23d73684d386ab15b27b/wunowawufejozajovi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=complete+diagram+of+digestive+system
    • 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_off000165ea.bin
f2759ed34b39ead7f888126a1731b97635b3f5de1b906e1d07e14b90cc456d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165EA 10948 bytes
font_01_sfnt_off00017f20.bin
8fa61f0170b46ebc3ff8c29e5c7c7e62a8e0a4e02d94012231828073611ba786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F20 17120 bytes
font_02_sfnt_off0001abd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABD8 16792 bytes

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