Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabf7947c9577f46…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 12:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 751202d86207674d3af9f6b60c0c192a SHA-1: d077d6edd0749f10336ce2bb7046fa73e4ee1b73 SHA-256: eabf7947c9577f46382e913dc01c12a4a00e7c2455d3a9f21d178ce2a67a9f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://prplus4u.com/ckupload/files/63452656444.pdf In PDF document text
    • https://big-affaires.com/img/pics/files/moveposovexutasetadixa.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/56140350833.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613635cc29186---kukik.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/70026791191.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/zomosokiv.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vovirabagigi.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/81583718006.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jujijaporomofixomuj.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16135997d92465---weluzizinikabuwexezunun.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/rifagafarodomezegetixuweb.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/1357200442.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/43684716537.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c59bc148506c0fea59c9a3a6ba5be877/14503017083.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nojapatujewuvuwutimuden.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/95612552520.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/rirenebibonapowififija.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/32400546526.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/66066225865.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329d6a9de82---31219590246.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614144c320d6c---17863234827.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/23034628658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=shield+tv+linuxPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23C 10136 bytes
SHA-256: fd2e0e2c7318551ef2dfabcc8d11f6c182038bf0b5f0d36a09c607e95b9f9ced
font_01_sfnt_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 16268 bytes
SHA-256: f063e96b3b083897171cfc531021e5af877ad8906cd8b821cf436b7b9967938c
font_03_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 17712 bytes
SHA-256: 91a01f77865e12e537dd7a793958e0f4beceb9f211a78eff0fa02d3c16a5b335

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