Malicious PDF — malware analysis report

Static analysis result for SHA-256 793dbfad54ffc115…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 01:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 211689297d9fc012237d07a217c761e3 SHA-1: 4586ea2ce48cb8040fe5b4e96b9fc3f94ddf69a8 SHA-256: 793dbfad54ffc115ce05c0e353c1ae20cd28a7f5fafc35176fc907febe0c03f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate the document is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=gastritis+diet+pdf+spanish PDF link annotation
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dp0nt869svaj4e6aan9pgdib4c/82600929904.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/tl3k7f7bpt7skued57k1iajm2v/15668114353.pdfIn PDF document text
    • http://humanlitech.com/files/files/34965821321.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/nejaxizuku.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/39741278832.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/retipupunamigaxulavufede.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/53553249868.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/f8ldlqu2t1vvjgsr2sjug3stbh/latodojevapaga.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161135613a79f5---29235434904.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec82b2ef7---37424675633.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/kimodutexafavulaketeza.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/30006985334.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/pamewumawuze.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tozudogawa.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nilexerikopa.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nonej.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/25ac769a8ec5eecfcbfee22b34f0a134/37703679820.pdfIn PDF document text
    • http://derma-dts.de/files/file/seretimul.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/jutuvuzovarakikota.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/bideje.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/83e475b09b2ee6711d48e51c19669a70/tumivomarunun.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759990d205e---tutabalojawa.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/71110053969.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4998d0da0---bomewoxijopenu.pdfIn PDF document text
    • 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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 17264 bytes
SHA-256: 0b1f9b7096967c050a5c59f19aa5e065351f0ea980ba768417a737ec62278654
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10468 bytes
SHA-256: 6e702b5a426347912a8ce42bc9e5e343d2f0dd5bb1f1c87756dd7ff55b0a2990
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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