Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd131aeda9128f2b…

MALICIOUS

PDF

99.0 KB Created: 2021-09-08 06:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 971a9baaee565cf3fc671d368b6e63ee SHA-1: 3030b4cbda05dc809aa314d6fefe044f37ba270c SHA-256: bd131aeda9128f2bff04a2a026dd068f8dc10b81c89f69e1ea67b1a1dfab6187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://pratiklinik.com/img/userfiles/files/21870865424.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rqvt8o0rjfh4gbqo6gs4sd7prm/69200228401.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/13528466470.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089b5b333e94---94414909204.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9e6ff22---wejudaruzeniwotenikezato.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c2ce8b4591d64902cd22b22f23a38519/miviro.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a11950040---zevumegijusal.pdf
    • https://0900107678.com/upload/file/vadazadexal.pdf
    • http://kantoromega.pl/userfiles/file/litikofurovezadob.pdf
    • https://nhachoxebus.com/upload/fck/file/33285401781.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a07e11627---48751598811.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b7b87c868edaf38886546e4ecb9e16b1/jidibu.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/79546269576.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/889ugejr8676453ucn233ig7pu/46724621403.pdf
    • http://hoya-system.com/uploads/files/202109032038081721.pdf
    • http://alacarte-grafik.de/userfiles/file/sejarepobiguzo.pdf
    • http://robedecreateur.com/img/files/wobunuropimewulozi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f1a7a4109244cacbe451e206ab5ed55c/kobapavurawepasugakuzosi.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/nagejokibop.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c208ba3688f90c9fca1b391432398d93/12793713469.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ac9a2e230437ad004a9ffa8c93acb889/8228908384.pdf
    • https://yodobashi-church.com/lenezagipobalawerozazik.pdf
    • http://hkbroadwin.com/userfiles/nesanejufaxefixejanu.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/magaad13fllvd4gl06dn6sstgj/99097332777.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8be2c3b0371f039c890497cb972fce67/50813216157.pdf
    • http://dreiseengrundschule.de/files/92583521354.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=parkinsonismo+vascolare+pdf
    • 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_off00011b69.bin
ff2c11cedea3ed947e5621dbc96c55a72aef776397389b13834757c6fbb2ad93
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 19000 bytes
font_01_sfnt_off00014d1c.bin
cd8fbe7f1c5f4e654a2dfd4d92ec4738064e443550555731536b8876b3121f62
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1C 10844 bytes
font_02_sfnt_off00016621.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16621 16792 bytes