Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e20497c28f7514…

MALICIOUS

PDF

84.9 KB Created: 2021-08-31 21:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f5b4f729a9f9d094a5b006ba0daa5206 SHA-1: 1f19cc0ea3ad4e2829453a1abab9b99807d49763 SHA-256: f2e20497c28f751478182c1f6911cfd830c74923f59e8276d20a4586a6f383ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to phishing or malware hosting pages. The presence of multiple links on disposable or compromised hosting further supports its role in a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebc8444b7---25491885872.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b26885d33495ab5bc055af01dd6b5830/gedajeverejutaba.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ftad98spg0ca3t2fu2j6kfekk1/18188249749.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/qkje4qf4knohair9sje4l10sh5/tululujuwapavupusumuzu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e62993bb902---88152410009.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fubilazivefuketafej.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/41531381579.pdfIn PDF document text
    • http://noidiengiaphat.com/upload/files/29839778276.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595176df72---55363976233.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/65362772352.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0211a71bc0313fc760630a0b11a63d9e/xigogafisapatofat.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2b494d71---kurebisol.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/popasenazavak.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16280460833468.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160900972a1888---6855230862.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09190bd98e---68817927893.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/38684608489.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d083ac1ee9---40576217119.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/65034908991.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/kibedowovetit.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/41114964151.pdfIn PDF document text
    • https://carlojans.com/cms/file/36558723989.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/18780297102.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5ee1106c64f39a7163c85fba794875fc/75392247817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=0.5+cup+to+tbspPDF 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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 18412 bytes
SHA-256: 20c4fe6d6a935a4ac36f2926589b734fd56a9f9bf4c31566d12a646e4f77e6d2
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 10196 bytes
SHA-256: 5e27e10f495b869ad54e6efe16909d667ef026fb9c7f9c757d354a2cdc468007