Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9332065f6334b76…

MALICIOUS

PDF

80.7 KB Created: 2021-07-18 22:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12ec5a98022b093ba3845c517056f016 SHA-1: f6f1f9c527a5e5ed8bcd7bfe9f25df291871b3d0 SHA-256: f9332065f6334b76134882d03c4454c1c0477508d208c350f5e3f5ad74ae7bad
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan threat. The primary function appears to be acting as a link farm to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://3dprofi.net/images/uploads/file/4176569201.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1103f40499a1dee211b0db139fbbce98/newetolafebodomoxiz.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/rusujidawifora.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071b60f65ce6---33443386381.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kajerinaxidekujanovokudu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9340ca5d7d---67099623046.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/a3btprurfoll80fmmp3c7basq5/96347293631.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/p10h9eo3vl4ppcjakc1vj3r3vd/40479516395.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nesevi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a1532ce6872de94d2f2e611445329aa3/89114889274.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea2b1c551---15152372718.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/3qi2m96h3sai31c86a4tcdm9pq/29413134444.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/xozugaxuwusij.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gemigobimes.pdfIn PDF document text
    • http://alltechsro.cz/files/fupafexazadef.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/80t88qn2mmi6loc6bc79oji8cb/10968708059.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/tekalafusabo.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xavenus.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xomimevunamafuvoxana.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0d7bd8eab357de87ef56affb54520c9a/kexureputalenugosomogemif.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/gg6ocrandi2ni7k2a6pllm6600/xediwefenew.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/rirutalujokabowelod.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/pezolilujupupojizuk.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e2eb5f6c87fbf16bb3953ab7bcf6007c/80145920691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=james+tw+when+you+love+someonePDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 16356 bytes
SHA-256: b806e4808677887715e0a9bbf3a472b024b86124d511477a620f29233fd10648
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 10540 bytes
SHA-256: 2d8cc65add838906ca18b9c0d7efe4e03083de961a4aac34d2a5bc7cedb3e10f

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