Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59ae5ed4b51895f…

MALICIOUS

PDF

96.2 KB Created: 2021-07-18 14:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07669c64d14a85974b533e96f63e58f5 SHA-1: 731ea4db4382e23cdcd15543a217a0a28ec26400 SHA-256: d59ae5ed4b51895f94386d685e7f7dc1895daa463613b434d4e03fcfc367449a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b494db5c616---72187070848.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb3659343---zudikibefife.pdf
    • http://geredekombiservisi.com/userfiles/file/xotarulojo.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609870c88a25b---kozusa.pdf
    • http://provia-events.de/pics/fotos/1/file/94511434805.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/42053143339.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0b98b7448---24509673030.pdf
    • http://centroolosprato.it/userfiles/files/68976914616.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d13e4d37c435bf7d467aed740d52eabe/detanexepumetotizogukiti.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/sn7n8k917bocb55auo9u9gr9t2/21286220600.pdf
    • http://chronocertif.com/userfiles/file/morajitiwubolejuxoz.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0fb5e9cd---14975773096.pdf
    • https://bititechnika.com/uploads/file/33865077812.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16096c6ef37a26---moweromixoxejejutulobesif.pdf
    • http://matsusushionline.com/uploads/files/xiperetikezi.pdf
    • http://mini-garden.ru/userfiles/file/62061744702.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b514818dd32---1988871069.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f367f13317---gabokelaluvozina.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a0f1c458864a6cd63975414e4cd2c9ce/80811840989.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/24d6dd974675f04bf974814460d702e9/38690121008.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48f50deb7---tepozuzefotusajewavo.pdf
    • http://tamlaproject.com/userData/board/file/jejemodupem.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f93cbc560---newimugokololazetodike.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae69dbe6596---nigadajumizagulireba.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97b5b3c9f---kulobu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=electronic+technician+interview+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ce.bin
ef67ea4e6c7bb6ebd9044dea3a6dab9b6f8f92567a00ef4639129b73d53ca97c
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 11096 bytes
font_01_sfnt_off00012b72.bin
f10d88fdd5837970a0d5ed284d02a5c5765f8ec745c8053f9f2564a1e8f6544a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 18000 bytes
font_02_sfnt_off00015ad0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD0 16792 bytes