Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2a9b65a1cf1537…

MALICIOUS

PDF

74.8 KB Created: 2021-06-25 23:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17709c9d9168ccd67eea6c0b7e15c525 SHA-1: 059f3a153539f3bd04e2ba482fff3b5548ec3d79 SHA-256: ab2a9b65a1cf153749608e4c09356538a933776beeedf955d670e5836b3a63c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f7d884d44dbd721eb681c0b298fcd632/10971040383.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c8768b6c---17776380865.pdf
    • http://bsbcarpet.com/userfiles/file/17334998355.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04dc8a554---57473787686.pdf
    • http://dianacb.cz/userfiles/file/76231109944.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927c99cddf6---kutojipetolenununega.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d86b204c---42173954250.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa90b014f8---kulexegusoxi.pdf
    • https://299-45.com/CKEdit/upload/files/19348886844.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42409f44d---51604597755.pdf
    • https://hunde-katzen.at/soubory/49756598872.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091af6b9a36b---83511111766.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bde7e56a7---81987179113.pdf
    • http://akinmedikal.com/uploads/file/zubukavudimapebad.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pamukatowawejewajijulum.pdf
    • https://banderlogclub.ru/Files/file/8648887846.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f778756eb---rixiradase.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/29tetifsp568c0d9e4pfvoj10o/fedatodetogaguni.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d3277927---31347575624.pdf
    • http://www.tomasjelinek.com/img/pub/file/bejeramesuxelabunevu.pdf
    • https://mimpiindah1.com/contents//files/67691366016.pdf
    • https://deniz-sogutma.org/img/userfiles/file/lokusukusexud.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/76ritb214dcn7c3ianceldgqf5/bawokisudegalinuripajobot.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/3402857214.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pohick+golf+course
    • 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_off0000c131.bin
505ab0adda23c68e36abab00b5eb40e2b7ea4c80df28b3c0c0451d0cd188d49e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 17156 bytes
font_01_sfnt_off0000ee7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
font_02_sfnt_off00010694.bin
2b5c2883b606630da4c65cdfff2ccec9cd95709ba1edf213240aa9ca464cb2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10444 bytes