Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af3cdb4f2fd1da6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 07:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 529a87711ffc1684eb58773d3aba688f SHA-1: 5d4c4a086e83fbf3e0cb578fff99d2d308209da6 SHA-256: 0af3cdb4f2fd1da6a6ee5445241c0192a849908c1acf673c41d8b1aa5b9c440b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.bankkartya.hu/js/ckfinder/userfiles/files/57299433715.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c5a11d28---8507362370.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/56450819250.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/851885c84ec4c1dbeeb3e1983ab0ec72/narax.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bekidetarop.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/jakorivegegukivupuniveri.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/91814787995.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf219292d6---40837232408.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/6f78cc6cd43ee241265569f39e008ea8/64056225321.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/takaganekajal.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fitejuzabofazomalepusid.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3a7777c3136f9687892670b9197eb65a/22629939466.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089abb694a4d---33888052542.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/lutuj.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/3112806261.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/71498596594.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/7tq34gas736e6eq7jiev790fe3/72202324729.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/97759652065.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f3510a95---jupajakegi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/45834366813.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f23fb452a---11702227471.pdfIn PDF document text
    • http://momsystem.ru/public/file/misomexagorukibeduzegato.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/sutari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=rca+hdmi+tv+manualPDF 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_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 18596 bytes
SHA-256: 62d9afee9190cdba7feed8b44919d6d4b09a0b6a5cbb23b26254b362e9679d6a
font_01_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 10328 bytes
SHA-256: cdbda73fae7783caef7fc46018bfcb53381e31216ab79b15ed0418cd3b57998f
font_02_sfnt_off00013fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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