Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9ca51736fbd7f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 14:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7405a7288cae79214ca066c595820ac SHA-1: d9d06673b7e5c8f53187f92f5acd2273a27c0a4c SHA-256: 42e9ca51736fbd7f3ee076f72303c57ca8f4e0f9c4fe2fb8c9b9e2a3986fc951
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a848295dc5a---sidipama.pdf In PDF document text
    • https://franchiseharbor.com/files/files/39989040037.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/bisapebedevoxel.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074892977dd4---34504076357.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xozejiton.pdfIn PDF document text
    • http://geodez.com/pliki/file/xefudiw.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/gotuzuzux.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d9648da4d3fa60491a294e4c2edae14b/gubaxen.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/kosofapilu.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/juworisovugujede.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9950954bb---32673754438.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/um8sp5f7ur2urchs4sdl0vmjvr/xamanafito.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/68039839310.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac30f899e1---wikijexawulugatufebudu.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2a8787108f76860bdd9f013870625372/dewudovixo.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/629989acddd96a67aa752bec5451b850.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/turesuwakisoduzit.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/tiseral.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/mogis.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/68970982208.pdfIn PDF document text
    • http://inistor.com/ufiles/files/welis.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/61266184079.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612729aee2792---sulovefijogevidulox.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/55955545223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+level+up+a+d%26d+characterPDF 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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 18112 bytes
SHA-256: 6b63e5e98f2ad33cad5e70e7c29b1824f44d430c674646198475419e401536dc
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 10164 bytes
SHA-256: 71f1b13abffc524dc0d798933af3a0ee08b51b543ae1fbe8ed878779fedc1ec3

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