Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab867bb8765caa33…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 09:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8aff0a98021af78bc9c9459ce6a1b08 SHA-1: 0763ba9e57e8be1a3b4441b3580ac06739dc5f34 SHA-256: ab867bb8765caa3399414f90cee76bcab1f65256ced8b3e72d8b32393fc9c8bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://goodmix-psc.com/userfiles/files/66606696502.pdf In PDF document text
    • https://angelsstaff.com/uploads/file/fexajizoxisesak.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/2301557496.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/27254350938.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jetobuluvodixoje.pdfIn PDF document text
    • https://ancoraeducacion.com/images/88339803691.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tup9oo659dgvneqka1upvfl483/romutikun.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/jokusojatewowu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/11o5akudgc7pv5pbvl2artstoh/bopefajorupekoku.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/66e0f517ad6abe9b5c4443fe0dee4a33/70000142742.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/83fbbe47c55fc190086ab4d0cf7dc966/64698685780.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/ronavimuboxu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2dc02190---61109048834.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d919c52b6441f5f4f2aa3f0c8a016c3d/85148360318.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/268602377.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/poneturemusolujunoxador.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/vululivewowuvumikiled.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/27002707004.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b9f1b936d---78099009120.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/23914422454.pdfIn PDF document text
    • http://beateromer.com/bilder/file/pedirete.pdfIn PDF document text
    • http://mylodge-naoshima.com/filivutodetaxiposisi.pdfIn PDF document text
    • http://mav-auto.ru/images/file/resumopas.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rojenikamabafawaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=finding+discount+and+sale+price+worksheetsPDF 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_off0000bf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF72 11048 bytes
SHA-256: bed9ae68355c4ce30d678b86029d6be3afa91fb5cbefcea912916bb64d9e616c
font_01_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16488 bytes
SHA-256: 52d03b4d0b55a8d22f28cf3e2424c4ed3b0b9a512e4b53f320e8559f4f86d8e4
font_02_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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