Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb334e08d8c56989…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 13:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21fcee9113f57e8f3c707ecad891da86 SHA-1: 27fbd54fe4339ecc8d322c0e973697e902865ae9 SHA-256: fb334e08d8c56989a866281776fe64b207686737b01413f51937e3df713ef612
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous unknown URLs, some hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of an embedded JavaScript stream further supports its malicious nature, likely used to facilitate the redirection or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://encino.ilovepokebar.com/uploads/files/28876162766.pdf In PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pokotereb.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/nofedapidixiduwurupikizim.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/38314780880.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sn30g113irse40448be1ronep9/jomevate.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/vusokugulexolodur.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dibojavoj.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/34181715256.pdfIn PDF document text
    • https://dm288.rs/slicice/file/4356764226.pdfIn PDF document text
    • http://huntland.hu/upload/file/tugivinokokasafow.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/58109175413.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/59482443437.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10549281946.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f193a13f0---kexoxisarinapelido.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210912_9CAB737DAC02772B.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/d748303a0b8ad6bdc15cd55340c85ba2/kaxeva.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/54403992532.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ou452ijj55m9eddkcv4enrqkc9/40817958383.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/vesito.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/11363512143.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/39939184932.pdfIn PDF document text
    • https://funke.be/data/file/70536927729.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/17042119833.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/suvelikulisefapivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=where+are+photos+stored+in+android+phonePDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 17864 bytes
SHA-256: 8e474e324aabf9739f91e36a33f0476d831542ed2f5da64c4ec48244b7ab4e5b
font_01_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 10436 bytes
SHA-256: 9b7dacf6be16d1ea0cc58e797d759797dcf0d7e9ce31d83bcf77d52f0bb038f4
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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