Malicious PDF — malware analysis report

Static analysis result for SHA-256 f804fe158c9b7a24…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 10:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bea332763e5a7e6c8f514dc09fc2303f SHA-1: c1c4c345dfdda3f7839a5702974f19c0a754e71c SHA-256: f804fe158c9b7a2448abbf67a44fa8a899e27ed43072f1f1833556ac1a5428c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://studiozammuner.eu/userfiles/files/13126631473.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28b63efe5---62531892104.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/samuwozu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/011f01a959bef61cbe4952c7852b5028/vapojefuwuvodibaxomekub.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9a3d650e8bc4bb2993c32b1369b7f012/82050867878.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/buzirupukopogagevewavu.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/84749857079.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/96109009842.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d27dbecfc---lamifafukigolojat.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5eb400225---7986630759.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b4c2b7632f8e763698ef50a5b2901f02/74059752008.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd549f313---ropigegonofanigewafutivo.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81878571414.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/33392591175.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e63e8860ae5d108af499abea1676990d/83572046887.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/50701923014.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/93750926257.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/bddfe52f31fe3ab796ca0daba3503e74/difugim.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/banunuj.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/48492609366.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/855e5698b325002c21a9385636a3e896/60859658680.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161131396dc53c---lunubalegonosureta.pdfIn PDF document text
    • http://moristas.com/userfiles/files/lefijolivosixotuzazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=s%C3%B6zc%C3%BCk+t%C3%BCrleri+pdf+tytPDF 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_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 19184 bytes
SHA-256: 1faf13a3b5e4e9ea34ed07a2f71fc8692c57713467f62e6d819539e00592e157
font_01_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 10804 bytes
SHA-256: 2bd714da6f7fb11dceae00f4ccbbfca413732870000f490edfcde7f18c6df6aa

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