Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbcd0007443315e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 15:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21bfceb4aeffb212b070a38284997ec2 SHA-1: 6492adc89790c003074e91ede1ca10e3beb3ff22 SHA-256: afbcd0007443315e73b91a9a2f90f7a4cd28fbcb0112a579ee491c02e13889d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS uploads and disposable hosting suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://alpanelektrik.com/depo/sayfaresim/file/62218973598.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeae79877---33290591352.pdf
    • https://zakarpattya-tour.com/upload/10936761382.pdf
    • https://dom4m.com/userfiles/files/93812747905.pdf
    • http://flyingfish-stay.com/userfiles/file/rukarunebavov.pdf
    • http://ambvetsanprospero.eu/userfiles/files/riluxomobosibi.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136962adbb2f---81941527346.pdf
    • http://wangguanhardware.com/userfiles/file/83821614281.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328dfc60a2b---22843358972.pdf
    • http://nasfthr.com/userfiles/file/xalomusopepuretinogizel.pdf
    • https://snf.styleguides.ch/userfiles/files/movimorutoregufola.pdf
    • https://darshanam.com/ckfinder/userfiles/files/68979921256.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2aef9fb9f1ff62751eee4332f7b0722f/2119595160.pdf
    • http://xinyuemu.net/assets/202109/files/20210918155532374394.pdf
    • https://akemi.ro/hirek/file/rojagirujatonopi.pdf
    • https://austdoorcaocap.com/upload/files/11864401033.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613426931d3bb---laguzusaj.pdf
    • http://wu-pao.com/upfiles/editor/files/bumipukagipejipu.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/028ce899ec9ef4b22fe4a21671fa9d02/84095460650.pdf
    • https://piphoto.tw/uploads/files/202109070508266353.pdf
    • https://ruta.hu/ckfinder/userfiles/files/21291087703.pdf
    • https://regiefranchet.fr/userfiles/files/89384470008.pdf
    • http://kroonzuivel.nl/ckfinder/userfiles/files/28102938349.pdf
    • http://srsheicha.com/uploadfile/file/74781336329.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2e1c8995---powiwitipanuxigujuludubiz.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/61897846620.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=guru+granth+sahib+pdf+with+audio
    • 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_off0000e627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 16792 bytes
font_01_sfnt_off0000fe3e.bin
c005e30468caa0be0b26abb85467da0cda1cdc07dba45e53a428c78903d0b132
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 10964 bytes
font_02_sfnt_off0001173a.bin
faa5e324d2fb7f3119eacc597a9373d59448e123c00338b7f44a885399b994aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 17480 bytes