Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df142e87ff8939f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 02:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eb26b4511decac776a5f057847facd2 SHA-1: 4fa8fc547ff43ec05daf9b4e9ba7dd0c9057dfae SHA-256: 8df142e87ff8939f7b29530c6b8a8ee6f9a9addef1401e4471192fb695d17519
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with few links per host, a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9317

Heuristics 5

  • 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
  • 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://kleinschadenexpert.com/userfiles/file/nonovowe.pdf In PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wazonururinuvafazasozo.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/vazoxulat.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1h6s98eg5rbsd13pkl4nlrcvel/wubiwuwuxuwatusaki.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fivorepofirufenokaw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613592c044354---vinukebazowisogimi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/81354371733.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8af570ab5---44880569526.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/74767735131.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/58999769621.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/lidatapuka.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/tawuvopobowapujuku.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/suboposaxosagirabulodowu.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1126556301613594235fbea.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/85775385034.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/885859149.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/825114137.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/63382768889.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/79503564732.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e83bd816e---96260690179.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/12804692539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hide+file+apkPDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 18888 bytes
SHA-256: 5cb8e37bb6c235adf8825511b45dd4c975b670dbbc24ef4307a1a56fa1db3689
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 9984 bytes
SHA-256: 30ec7849af1a462e31dbd22f6efb4a95dd6a1440e1151cad400868af909d36b7

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