Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ab6ee991b963b8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 15:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39d19aa9140a72b17f8f0d94201b8813 SHA-1: 6817a8fa7214d4e2b9bfec5734981958d8f0164d SHA-256: 31ab6ee991b963b8f3f1539eeff6e58df7fe2bef18c2778d19cdcb1596bb9b04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=phrasal+verbs+down+list PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1d5eaecc---3759944177.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/firagilubelitawewax.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/27205130762.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/xunaragapuzus.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/40854119037.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5057c88264bfd40240b603e4b1ef2039/jubazomasijade.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/25572988613.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/66562270704.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/gujajefunumeda.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/hdtl8f8vaimu760fv9r42mmmhf/kumipikavejezovinaz.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83915370100.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/muxurorowogibonuk.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/rilorederinokosapofowiz.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/fomesegegolulopalowi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/viwikugajuvididiji.pdfIn PDF document text
    • http://guitarenko.fr/img/files/60613026614.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///pigafugilasevuvoginokuz.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/ziwukifevowuteteduge.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5fdott4295mdpk7uf5ju84tti3/20332414232.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/retapuwapewar.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/94045976743.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/84301445967.pdfIn PDF document text
    • https://khanikango.in/file/defajisivifigekizofadiro.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/34775634195.pdfIn PDF document text
    • https://stotex.rs/files/tiripaxuzijuseb.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/sakojizuduvisu.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/68982918483.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/foxazerojixasad.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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 18724 bytes
SHA-256: c01b01ed56c8ef9987c0b8fa18a4af4618a795ddc28385420d09171f409f33fa
font_01_sfnt_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 10636 bytes
SHA-256: 1abafc13741deebba50ed4db361a5e0dd4ba6400ffc1d1751999188ed31d63b3
font_02_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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