Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f991cf4b4c58e6d…

MALICIOUS

PDF

59.8 KB Created: 2021-10-13 07:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a07b795cf910911837913c129999f9e SHA-1: 38d9d0f42d02d55ff0053b6b6cf238e24c209c7a SHA-256: 3f991cf4b4c58e6d415a8fc8b952fccb79dd1a7bf58dd1848e3db64cea16f499
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure indicate an attempt to disguise malicious activity as a normal document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

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 https://schachverein-marchhoefe.ch/fcsr/news/upload/file/37932375676.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/36e0e1fec8d3e0db743ee1af8ecb0a8e/juridiluvinigawozorumu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/75592530272.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tptcmed4i0hipgtja0e2argci4/64233155667.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wejuwemodikefeteg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161598cc16109e---32465005820.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/fizevefanaxapoko.pdfIn PDF document text
    • http://tianfonmm.com/d/files/68640560672.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/guretowafuxezenapida.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/49780384408.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615055715570e---4205031019.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/98227505110.pdfIn PDF document text
    • https://invest.pl/userfiles/file/42239095802.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109062104394161.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/supifojolu.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/16328914922.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/xedalinewilelukaletito.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/19598271647.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/64027741072.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/ridomipolozixewamaja.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/rusasiwefemibikodirezuk.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=vw+polo+owners+manual+2012PDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/musewi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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