Malicious PDF — malware analysis report

Static analysis result for SHA-256 6951f0d00bde9fd0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 08:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe47177c8695abb2e33568526658abdc SHA-1: 424c247599672939b81386a773b048c7de1e32e0 SHA-256: 6951f0d00bde9fd0921d1ee3505d6233024d1f6ff44a18b28344108295568e40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

Heuristics 5

  • 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
  • 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://facilitymanagementassociates.com/survey/userfiles/files/71688723840.pdf In PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/57609279138.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0543ef4c---vajigibusetoxaxumare.pdfIn PDF document text
    • http://poiskvod.ru/images/file/91190615408.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/1387196570.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/pisowarelexono.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zewejanuxiveseka.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/26920976648.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/tezakunaman.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/20826848726139796a11556.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/77620066986.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/gegisiko.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/88057769238.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vovix.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/86152899733.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/59943624666.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/65984471617.pdfIn PDF document text
    • http://lejonhund.com/upload/bibem.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161416687a3dd1---tesogijefudolamuke.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/jidumabifo.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gamovorarovijunuvon.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3eb77e90---wotesiteruzunezatunes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=c5h12+complete+combustionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 10952 bytes
SHA-256: 23882f89e692b814e72d922129521eac5121f5edf4b464af38ddce61f501d99f
font_01_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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