Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02b8a0597b80693…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 17:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5085662a776b569b940aa8d43a561c60 SHA-1: 09ca7f43523805ed8b54fe8b2fa9713640b45753 SHA-256: f02b8a0597b80693251687a724089df84b95f6520df76bbf37a6152f53f72f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://chupwo.com/editor_upload/file/gebipovi.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e0b062ba---bijosaxalikugik.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fh04ibvb56kg59p1en3rrh630e/38601587811.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/42682521152.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/113c9f12c792fc1e1a4225874eaf3b68/nebuzefupufilegusu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/paxixijomurokid.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/togikasodejeva.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gesevenidexivatadozejilug.pdfIn PDF document text
    • http://skupka23.ru/upload/m/52650547831.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096f92e06cf4---42423702630.pdfIn PDF document text
    • http://becucci.it/userfiles/files/25163252163.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f5le4e946e93nr47d36b4epiq3/68645425113.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/h9jitgjsv4puv2a6a549ck0a7s/xobugadi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d09c50040cd9fd5b21c18d7c3a3a77ba/nogixafepe.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/52g9hq19jv4g6044m4kgu7kja0/febiwidivoviruxulilum.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/pinugam.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/96454244778.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/42963089227.pdfIn PDF document text
    • http://geose.ru/userfiles/file/44082003832.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ojqc4lf12s3mfrb713oacuemu4/71806026624.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/630b4bb516771614349a2c05d582bf2d/35521611521.pdfIn PDF document text
    • http://greenbrier101.com/userimages/84297950892.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/80859603882.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/karofogudiguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=horizon+fitness+t101+treadmill+owners+manualPDF 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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10928 bytes
SHA-256: 8ca62d87865785bd13efa8a748f2d95faebc05c0f9b78cd55d0a723c98e7daf9
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 19780 bytes
SHA-256: 65abb6735dbdb391343799bc2b1ed8f1a645a490ebef7136fb3708d68945352c