Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d11f283d8f771e…

MALICIOUS

PDF

89.1 KB Created: 2021-07-09 20:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1a9c1cfc01c616297e010a012cca072 SHA-1: 4b2bbd60e235f01068b10425a8f3505a5654d649 SHA-256: 75d11f283d8f771ee955d0e917afb35be42da8fc098b41ec35c0590c2ce3093d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://pensionpoint.cz/userfiles/files/demujarumegazuzotur.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/139536de6aeeb9431dd0782cf60b457d/xuterapoxozosedoviv.pdf
    • http://goldartline.ua/userfiles/file/60084073518.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01ef38acc---80734796750.pdf
    • http://allamericannursing.com/userfiles/file/gotuka.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/qe8o695hu1n3kci3cnmd59o374/xidezitetosabepo.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/652d561e3b4279f8b803d91a056d8968/lipazemef.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8aca7a87f070a554d9aa3a4684b3af65/17969009669.pdf
    • http://lapenya.cat/imgjovesnaves/file/9522521729.pdf
    • https://alamansyria.com/userfiles/file/36924775540.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sgvt7q93f9a60nmgi2mn4hgt46/kakazuloteguxasoveruj.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/ditixasudixizobefas.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4ba485ce7d5c822b7b79894a3492707c/muxilefuwiwosuginivowim.pdf
    • http://animationcoach.com/userfiles/file/93485623649.pdf
    • https://fnb-concepts.com/images/uploads/files/80642297849.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/goraxojuniligig.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077b38082bba---15889958640.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/99ecf2202c391b341964e0d2441d476c/74126878292.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68bfafcec---51551308703.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2544b336882a26b2b443a0980bcce55a/60336070852.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074149d5606f---94808500754.pdf
    • http://lorichphoto.com/pictures/file/29182094890.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+repair+in+minecraft
    • 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_off0000fb3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16792 bytes
font_01_sfnt_off0001134f.bin
9ee85807805b7b0ab000ed5a1c810a55cdc98e1ce1666404c06a91a47b281af0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16836 bytes
font_02_sfnt_off00013ef6.bin
63c369bf9f96cb6b1fd645a7c735d15a01e01c73b4d2a9a8705f77824a4945c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 10596 bytes