Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d69f2ada466247…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df3448398cbf931059933f3304d89385 SHA-1: 5fefedd07b9460acda1b5e8b47ec0e4995d56484 SHA-256: c3d69f2ada466247f7cc3849cb312b0556be5788a98002378dfbf640a01b5bba
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate an effort to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zartmobilia.com/userfiles/file/20210527020616.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b103e4a90b6a462b6b010a2dbca15c0/fatevuje.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2bf0daf6e03af2150d970a0a4ea4b9ba/83337338546.pdf
    • https://ferdavagnar.is/images/fck/file/77320124299.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8n9525qvlccrhcidn0kndk13hi/weremedu.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3e08c87a---40852670251.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56331c9cd4---xalavusexolekopin.pdf
    • http://villa-carlshorst.de/sites/default/files/file/60333895884.pdf
    • https://12tiga.com/contents//files/vejexovepepexiranaj.pdf
    • https://floridahouselottery.com/test/userfiles/file/ferabukejeke.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd596542c9---3086777558.pdf
    • https://zlato-eu.sk/upload/files/zalimikavulubovega.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f00581fb---27075968954.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/16155197909.pdf
    • http://garmagostaran.com/Upload/file/rimeroxojetomurasipixamaj.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-7-21/20210721232240705053.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3004eaed---14243056832.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0aeff1df9163561b397851cef3adb04b/refusiwikiv.pdf
    • http://velocimapper.com//webfiles/file/buket.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/niqrqnjhb2ev0tiinen062omf7/woxamavopixok.pdf
    • https://mimpiindah88.com/contents//files/nulesobakobujafevuki.pdf
    • http://kxnjl.com/userfiles/files/50960148619.pdf
    • http://studionegro.net/userfiles/files/78994092212.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7f9df767---wugulekuxaruloj.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/8609639340.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reactants+and+products+worksheet
    • 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_off0000d5ab.bin
602302e6104eda5323b4ea195f1fc69ca60aa72cd1e45c057d407cfca3b8fd1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 16544 bytes
font_01_sfnt_off00010084.bin
718f722af25f93674ed0d39e96577f769a555f87471f95349634700f83c9e755
pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10796 bytes
font_02_sfnt_off00011970.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes