Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdd79f424323b72…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 21:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e53f866c311e8785b94030e9a96b8360 SHA-1: a61efc8162ea657fb54f0419e3a9109636b39087 SHA-256: bbdd79f424323b723fdf66fe84295a0d99e63194730dd53177028f18b57a7fc8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and other potentially malicious PDF files. The primary attack pattern involves directing users to these external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://pakistanchristiancongress.org/userfiles/file/malomululegetolevo.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/31155590152.pdf
    • http://onsijsselstein.nl/userfiles/files/2130443852.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/77487430267.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161385a7354b0d---xisiwajogogakebegav.pdf
    • http://lejuriste.ru/files/file/lulusevikimi.pdf
    • http://irvine.songhakbbq.com/uploads/files/91297178146.pdf
    • http://etcpremium.com/userfiles/files/20297973211.pdf
    • https://brianhigbielaw.com/UserFiles/file/72993954817.pdf
    • https://alakharia.com/public_html/userfiles/file/xudunufivusexozexi.pdf
    • https://realxenon.ru/uploads/files/39075520758.pdf
    • http://nuraski.pl/wsg/userfiles/92115232142.pdf
    • https://netiko.fr/img/Data/file/99307689061.pdf
    • http://tw-tms.com/uploadpic/xw/files/96861433763.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edefe6e343---wodotikalofizaparugadut.pdf
    • http://tuyothuyluc.vn/webroot/img/files/lojubimeze.pdf
    • https://impactmediaresources.com/userfiles/file/24066133621.pdf
    • http://chenruichem.com/upload/files/punadurokirumilofuj.pdf
    • http://revucue.com/ckfinder/userfiles/files/jejewagubel.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/37239983803.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc8f28a04---46113462154.pdf
    • https://produktybhp.pl/pliki_user/File/bixar.pdf
    • https://aldurra.ly/images-editeur/img/file/tulujoson.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=incremental+k+means
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78a.bin
41b5e83eabde9aad22967be9e202d7d4737f6929a192ba1c42d57c67a4e12c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 18808 bytes

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