Malicious PDF — malware analysis report

Static analysis result for SHA-256 f868137d7e002d0a…

MALICIOUS

PDF

70.3 KB Created: 2021-08-05 01:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbc851a698aef9846b9e02da950c8561 SHA-1: b070c51ae7d6e7aa540a5f9661420cab93ea7556 SHA-256: f868137d7e002d0aedc5bc4bdccf41a34467b9b5ed20367a7cf03a07c092b396
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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 https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o88orqbnobkmeidiebj5mi59o9/47433823968.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9e15144e41e84e2e9674d385fa446e7a/jakemimorerejijebodoke.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/6379570360.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb53ff2064---76104906150.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/garipapafapu.pdfIn PDF document text
    • https://cecprint.com/images/file/perilenerinaxisogok.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/57770462643.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/51834994561.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7nkbcajt46pbrhmg8celeoa11d/filubiwarulixu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/meraxuxepigadekuke.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vukovujosu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/kumogulizajuxepo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/85960978369.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec3262669---zubol.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xuteramo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/niroziwawiwozobuka.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/pasizetewamerevobepa.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/lopebazefakus.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d65cc147---29161845777.pdfIn PDF document text
    • http://short-story.ru/upload/file/86312230425.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f4d9d01d52a565665bedf68b5b2c9ded/zefibufanubotorova.pdfIn PDF document text
    • http://fotossc.pl/_files/file/99550855300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+java+edition+free+download+for+pc+windows+8.1PDF link annotation
    • 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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 16464 bytes
SHA-256: 0ea820cd0bf154c06d4fe8b379d86a5c2803bae162da9d6964326d545e309b17

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