Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e277a705cb2dad…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 07:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e5a5fc185c1677a7e64abb6d0a9ad8d SHA-1: 36760611566d55d012f60ffc009a3530446ab073 SHA-256: e4e277a705cb2dadd0da2bb8e9fe0f99902973559ad8b8d55ed357d1d7723071
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. ClamAV and an ML classifier identified this file as malicious, specifically a phishing trojan. The primary attack pattern involves luring users through these links, likely leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dpj7dkqp2t11hhb7ukk03ni47h/84864391349.pdf In PDF document text
    • http://billedbutikken.dk/articlefiles/file/foxufomi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6b48cf1a---51940658741.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1a60198a4d0175fdffd05fe8da559f39/69955675031.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xabumepunukunoxaloto.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/92518997691.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/64137445044.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9bdc4739---43673833313.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/toxuketupugewizegufe.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/poduxagodalawugidizowovo.pdfIn PDF document text
    • http://axwelindia.com/uploads/93905675189.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/lixitobibos.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c157ab2f0c9---jigoxevilizuzitusovape.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xekeboben.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/favuzipobaranubopuxizagox.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a0ff8d03e1d2a0ed04ff3e4a0bf100f7/6792764741.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8h1cspdh8qvhsgl7a5lno65j9j/39042952403.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/58d1df65adc3ca1b1d6553ee138f3cae/6419721633.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ce5df0ec4dabad8e41fecadf7b49ef6b/10451308414.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fli6pvq5u0j77kr6u40ga01ct9/josurumawipetewodebikulaw.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8422fea52e779445e89079a705930f08/33121434572.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0bed424b---zusinemobamuwonakekuga.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/34889919382.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/80409730584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=solid+principles+examples+javaPDF 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_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 17312 bytes
SHA-256: d2af5a1f0ca3d90d4facca62cfa2944e936b135d9427f6761769e59f11570701
font_02_sfnt_off00014479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 10952 bytes
SHA-256: eb015031d4c4fe0747c158f2568cc85af66171c81828c36b5c0305ff001ce0ec

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