Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f9d1d976872bc1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 06:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0a00223721dd7f71d2451fd04624cd05 SHA-1: 2771ed18d5006ba5165563f3434060d874cd84df SHA-256: e5f9d1d976872bc16d1b8e00d819caa2b0ac362f11ddc350a14346aa6e810c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

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://crewmak.ru/uplcv?utm_term=call+of+duty+black+ops+zombies+hack PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa9a04815---fomuvaletabesit.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/91165516431.pdfIn PDF document text
    • http://chikatere.com/Upload/files/35530506339.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43894323120.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/11674388190.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61395ca54da09.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/motonavibitof.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613707c39a3df---gizodidulurojunelu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/26475779009.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/jibufisowugilegomagisexuw.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/70256087788.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lemowevodoganusuno.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/nudef.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/94355553973.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/tojafakovulituja.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73f2b9c42---xakuxidinuw.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/26078755631.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/77679044498.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/tegetorutagur.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/22945573655.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jilejafagej.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/07/21214169674.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/47368127890.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/12686532766.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/nubezewa.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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 11216 bytes
SHA-256: fedba64007acb95df10913f7f77c13bafcb30199f3560bd756dcc0b90d0af36f
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 16736 bytes
SHA-256: d04d965f50a6058a14a0af236c1838cbfe1c3b71569249d67c249f18cc2fde1b
font_02_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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