Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd45d8b9dbff1ae…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 19:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 024ae9b4a038c64eb5c9bf43ca5f2af2 SHA-1: fe49393b1a3451b054411f1af3feb52282f78d9e SHA-256: 2bd45d8b9dbff1aee537ab30b0beeefe393daaeccbee1a86cb404ab8d8ed3d60
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. Heuristics indicate this is a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/52806a9dcf63cc9bc3d676f3bf694b1c/wubuz.pdf In PDF document text
    • https://swalaya.in/userfiles/file/36816343308.pdfIn PDF document text
    • http://stevis.cz/files/file/55726520133.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/luguvek.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/4065496363.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5ebd9a3a618c458bf8ac41bc14c78020/75443352125.pdfIn PDF document text
    • http://chinalabware.es/d/files/xilitolenofis.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/ponevufipejamupiza.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c50909e0---77886839531.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085585aea265---80891240903.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f2e0dd343c1a958b99f294edf97f75f9/wiliranorakudobisaro.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6afcc707---53906951180.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/varazat.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/73821309579.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/53319519193.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/felamez.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/949b262686dd131cb97069ade1524ea6/58980499242.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/87408060979.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086eddf983ce---vubasasafofile.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9883p2dmvobiv24nuds44lr7m7/xitimupasubobijodixadera.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/12394527576.pdfIn PDF document text
    • http://citra.cl/userfiles/file/votozejuboxinirote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+la+leccion+de+august+resumenPDF 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_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 17112 bytes
SHA-256: 2ffb7ea96e2bde2b8011d0c96ef5da79ee1439651f30ccef5ea94f21c08d10be
font_01_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 10912 bytes
SHA-256: 5afc78c883b77fedb7f0e1f47632fb437335168213934c05a6b2a76834615f72

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