Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52dade27117e459…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 08:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24187e576629e7ececf2ce01d09a5793 SHA-1: 7f72b06f0b3963f87cb1ed1824a6455e3af99565 SHA-256: b52dade27117e459e1dc39f2913cb6d2b61e4e359cd99dee5ed01d26036a3872
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=batch+script+programming+pdf PDF link annotation
    • https://brahmagnanam.org/fck_uploads/file/tadokawegalanoxavu.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/fazedonofezogujol.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/xibinebezodiduzujoxiv.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b235862a3fc---vujukezegenupan.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/9338364968.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a37d1239---58470812294.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23087c970d---rikosexom.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d39a2f1d5---likuxudezebivekot.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/26086011434.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/36970a198b25a32c21591de40f180173/16050722629.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/dufafujenazosukagatu.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/85667870742.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/35670795073.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9rguuj50487qu9t1jk3qbuhat5/55423386429.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/2257858599.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94505522864.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/96vac3ob2o9155ct305ci6ibg5/jarerigadapejesokujo.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/buwosafiva.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/buwiwunilenilutugovejipa.pdfIn PDF document text
    • http://carszana.com/image/upload/File/bebumokufufoj.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/31012979995.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_off0000d0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 18460 bytes
SHA-256: 879d9210827a413eb6b62186fe09e80f6593eaa6626f53e69c18478decec8416
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10940 bytes
SHA-256: 5b226c724208ab5388269435c9d9eb9aa002222c493e07c55f824c29cd34259d
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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