Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b353ed04b92b68…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 15:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202d65444f60775fc2fbfddc358be25f SHA-1: d5a94e2a314b4be3f7830b5dd5fbc5b2e266d425 SHA-256: 98b353ed04b92b68bedd835a322aa0640b1eaf30781da3e9809ddfb555967c49
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF's structure and the nature of the embedded links strongly indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/qdad91sqnfe8k7802oiubhijm4/sudaluburipabigik.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/592b7abd37a8d628899932671f21767e/lipuvazab.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c0e00e9135d16183580a4f9cf2fe7aec/gajujukasitikuma.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/72155154b089a1e250182115bae4d886/tenofipafegajilasu.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2559b6b896---sogedozipexavifezidosu.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2430674a---81726699737.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dek78963a05l7m931aqnmstqp1/79778427165.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea747b3fe4---36616270318.pdf
    • http://andlupa.com/userfiles/file/85132923968.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d2e6dab7858ed7ede7abb25e5769d8aa/bawawupepexidaxezu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6cb4a569a---30743544023.pdf
    • http://skiflogistics.ru/userfiles/file/rixotoraki.pdf
    • http://refta-bg.com/userfiles/file/45979360853.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6765c012341abed98ef75acaddcf3c3f/91872518760.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lclv5fu3l0ibk91kk1abnqov91/11970217811.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef80aa18d2---84073089412.pdf
    • https://copab.tn/216mag.svn/uploads/files/xobuwimojonefimozadi.pdf
    • http://renovator.cz/files/file/19362305565.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/20aa761e1eb04275f1a5f907503dd490/9138106494.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a05974bcc---mopekixijetika.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/492eiv9k751dl6bqln9iqb75mr/dibugu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+intrapsychic
    • 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_off00010005.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes
font_01_sfnt_off00011817.bin
c2f01d5bd34c90306497b242ef5db6cdc39da49bf5887351c2acfcfd295beda6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 16368 bytes
font_02_sfnt_off00014283.bin
9b1a7977316305fb042c27ac74eb732cd0f3e9cce1819756fdd3efa50e41d04b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14283 10820 bytes