Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6813fef9bc1ccd…

MALICIOUS

PDF

116.1 KB Created: 2021-07-24 03:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4df12713de12e474f79dd46378abec4 SHA-1: b79666aaaecd7bd019f07b34f869db0bbcc94383 SHA-256: 0c6813fef9bc1ccd82bacf3561faad11390a8cad4ad96aee7e45b79600c37a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, indicating it's part of a link farm designed to distribute malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's intended to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d399ea9f93---64436841996.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2b2400ff09a33a405c2053e204b8ef7a/45335963382.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6eadc2869d260102b277ea5728e1b9de/nodukumi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/lazivuxitebexubavo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wufumanukiwitorafug.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9b33bf42e7efbc381d06052b32c72339/refozakuketoparefatu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a8975a26---8264414557.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/005dafe955bda723ad0975c9c15b6593/texukifewobifutix.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/df8c202811dd860a51475b76d7f067b4/93958067234.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69f31453e9---20469584610.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/52093481244.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/pulapomidogu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/eeb5cf08b6eeef2e1a2f2a914679fada/87852197777.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bdf6aae46a109d5fe873d7c689501d50/73889045751.pdfIn PDF document text
    • https://aneri12.cz/res/file/vebetibilawabododewojam.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/85855342351.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ed1e9ca2---pinabejipexov.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a8c35f3b---97655937286.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e718305ef---wuzukuvufu.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/nukijumisokavakodex.pdfIn PDF document text
    • http://cjatkinson.com/userimages/goxarufelizokape.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/593e2d5c6ae9d55a83d2faf2e0375cdd/26114690558.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/fabume.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19893041918.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ddad0756---50721816996.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c345363acc4---viwowipexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+were+the+disabled+treated+in+the+1930sPDF 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_off0001637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637F 11076 bytes
SHA-256: 9ef73fd2483ba1aeca14f124ecbdb5bca345b5aadd6aac0abd3db1dda87dc900
font_01_sfnt_off00017d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D45 16708 bytes
SHA-256: a5ed291e570e90807d09455069c3c1b45646aa1c4ad609285c88c64c5ec5ecc7
font_02_sfnt_off0001a8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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