Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea461e4adb28cdd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 12:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4faf89d0d6dee23905e2979420228ee6 SHA-1: f4b0f6a29cc56a3bd7d41c05f77ded608c613e17 SHA-256: bea461e4adb28cddfeb23aa6589b5336ce9b6340ab6d2ec528d5f3a1f0d5faa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=video+show+full+apk PDF link annotation
    • http://bandenplaats.nl/cmsimages/file/95481316538.pdfIn PDF document text
    • http://schokozentrale.de/idata/zesevamonaxanupedukagut.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/25906058979.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tipilebaramonunaretibarop.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2438db68cfd190b41b7dc66acbccaece/64088020310.pdfIn PDF document text
    • http://smogy.ru/files/files/bawopadeg.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/22729885658.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/37063937174.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/76141641283.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kusazelevef.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/2586973012.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141cac7d4045---92583201915.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/panirurido.pdfIn PDF document text
    • http://full814.com/upload/files/tewosenifinoxisonigen.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/17816655308.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/59876329606.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/97138987984.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8fafdf19bebe840c438fab73c86ea97e/gopudamot.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/36965690374.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kurexafowof.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cgvn8iu744gcjhldovvfn1u924/zanifodilipomizobit.pdfIn PDF document text
    • http://tianfonmm.com/d/files/papot.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gosorinajare.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_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 10540 bytes
SHA-256: 4ae8514517f19c9889027b77a24a8892c8464fb1863d835ae7ffdb10be2a2917
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 18512 bytes
SHA-256: 3ca0ae179730145f2f386c3b0b59324ec8510c79bd2b0ab8204bd07c41cb74ac
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1