Malicious PDF — malware analysis report

Static analysis result for SHA-256 810827ce74c9789d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 17:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4087293283429672c3bd83e310e3ee4 SHA-1: 3bc66c25786e7e5514c21d1207ab64a4a5b9c826 SHA-256: 810827ce74c9789d3fb254c0b56644acda7e22b0514b380dd985c6c49de6eea5
154 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6883

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee17d1693---62184081203.pdf In PDF document text
    • http://fence-alarm.com/userfiles/files/94242078963.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/74279668122.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/jazavekixafoxalo.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/15019221353.pdfIn PDF document text
    • https://chptravel.ir/data/file/58032067003.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/gifisugogu.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/mupeturilumekan.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ocvcukviifv0jlep3tvd9nk5j3/69001211993.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jdadre86tnoi2e9k9si3t4saiu/85874824040.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7fe2efe1ea0745a2374409bfd121a01e/37525791032.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/dorakidexufuluxugelujalof.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109100656183452.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/gidowisudibimas.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/pitavepelup.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a46206714c---15873000274.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6e5d77b---24441778975.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/26704124533.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/41748901167.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161301bc8e9f2c---tesofamisamifipanewerak.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/93539929395.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jasesi.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/44192212880.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/topuredenuvipegilesepodu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/29690031151.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fb1236f086826dc849545cb0e146a8aa/zanodi.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zuzamel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=murray+rothbard+pdfPDF 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_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 10400 bytes
SHA-256: 2a2c73992b3df03d155e09ddc234457ca783592b7a68df193e0813b653ff227e
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1