Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4db22ab635b39d…

MALICIOUS

PDF

96.1 KB Created: 2021-09-15 11:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d6db46e52477bf2308c0ff24452ce92 SHA-1: 1f954d12307c4e1546b3197edccd5195ed2dce4c SHA-256: 9b4db22ab635b39dbf0cd5a5495038e163254fa46960f62e62b769f3f0508938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to leverage search engine optimization and compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=merchant+of+venice+paraphrase+book+pdf+free+download PDF link annotation
    • https://angem.fr/userfiles/file/dotudupi.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/mafafapozedo.pdfIn PDF document text
    • http://lagrupacio.cat/file/fedirejibut.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/xazemazire.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32172136712.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/deturevabisusonelajo.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/lexugixusolabufagi.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/59093551968.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/76547157663.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/62560598197.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/74585254727.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907164722923286.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139d49c011d0---vevur.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/ziwivitoguge.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210907091627.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128c9dfd9b---81989740328.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/sodakiba.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c237f352---lujunuziwubakusin.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/getotemasaxobaleximofe.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/47867772775.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/jokabogapamuw.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/zowijod.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf13192b5---96753979239.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tanopumadi.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/gefesokebu.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_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11092 bytes
SHA-256: 75c74ddd6f630820b4f96ab0d9276cc4f2f04f7989b6ac1ab0bb2e713ab0c3ba
font_01_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 17840 bytes
SHA-256: b2835ecba1583c8df2773d67f33a65d16934550f21acbf2348f28bd1e6836ec3
font_02_sfnt_off00015995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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