Malicious PDF — malware analysis report

Static analysis result for SHA-256 229a1eaa83802ac9…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 22:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2385d0463df817e032715727600d949 SHA-1: 7daf8246c4ee446b50b82f7ddc12792821cd7559 SHA-256: 229a1eaa83802ac9c756e4170a86048f43338a5f1908c9a21f88f34662b1779c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload storage or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=financial+accounting+reporting+analysis+and+decision+making+6th+edition+pdf PDF link annotation
    • http://www.udelimpa.es/ckfinder/userfiles/files/48573952538.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nesovisapadused.pdfIn PDF document text
    • http://tencanpowder.com/d/files/bubekirerelidugibejodoven.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/pt6b9q3ncq0tbusvte9ne9gq5n/lazafo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1b8qqkkm1hrpdk0617mhlouhm0/72768811507.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/remumipupimotujetipav.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08f9b643c---sepufikovefowipogigolizi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c100ecfb5b6ed8888615e596b5d68fe1/86775565523.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zunazomibumasas.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/245086afd1ab4aeb094122fca3900d03/sogezudimipafiviguzop.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2d91038f---29529727912.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/pusugewubejuripigizaza.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a530490bac9---wisix.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tonukofuluz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/14673236048.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/73504598146.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pk7upceadsd8vt49the3ea0sf4/mosesisaxaxidona.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b0164423e13ae1e60c43d78586d060d4/begekubibobedowasuru.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/68104690856.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/pizovapi.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/90409895224.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tbv5j8geeb6t2asdmr3sfo8dc8/zavedukekad.pdfIn PDF document text
    • 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_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 17152 bytes
SHA-256: b90c95cdf106e00721cd0941dccc6d2fb515858139e212b8521a3917b1a0a6a2
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 11516 bytes
SHA-256: 005f092f2e266ec12bfe84c6d19708893e1b8288e47de37b8920750b82c0bb50
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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