Malicious PDF — malware analysis report

Static analysis result for SHA-256 258f9b0268fc0241…

MALICIOUS

PDF

94.1 KB Created: 2021-07-18 06:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c49f7696782a36dcf06b1cdc1a0c64e7 SHA-1: c272dc801c46920c21c35c69d3575ea38b74cc61 SHA-256: 258f9b0268fc024109bdaccf681c907fbf6dd0342206967f6951582cabf15ff2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://footballsod.com/images/ck-uploads/files/81116677212.pdf In PDF document text
    • http://blackivy.pl/userfiles/file/64059759494.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/26380825442.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a51700b262e---guxosivazepebebetebolor.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/83653436647.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/15015452284.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae90fb787d---38338802487.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/81488007a645f09ccf07ba2b6ebcbca0/gidepilowenof.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1588fbf5a7---52503236942.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/1651804976.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/nezudifovup.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c32af41516c---87511885417.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qmf4tmsfr3hcg7k227fas6uo8q/pifazekopagixuj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2cdeea5bfcc0ecd5478d124ea281a945/37279808156.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074526666450---bevazaledibo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d17ac9ac2---43388879316.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d93787e64---kenevawowageferepe.pdfIn PDF document text
    • http://huiking.cn/uploads/file/272257241702.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/puruvuwomubiwiwaba.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/acc7e4e8f08d9d3bc8a7f75622c9329c/16604715268.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6a6308578fd238c805f4b2e300cf70b5/xaseb.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076912661a25---gubelomikerofofeka.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pa5ja1hfjd2vfht625qv8443ma/gobifozegiwetufofokusez.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d13021f86358fc0824a33106f840c895/19924273107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+absolute+bestPDF 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_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16948 bytes
SHA-256: 50253ac52126c0c39fa73d3c3c6eabc4432c84ed788cbcae5786a06d46a85948
font_01_sfnt_off00013c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15462 10112 bytes
SHA-256: 12fcdc3e4e7f075e1c30bd9a39aa7e2ff1c29f4d3c8e93ecefd069fcabe3ea22