Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bda1a888605c5be…

MALICIOUS

PDF

51.1 KB Created: 2021-09-30 20:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0b315e3fc174f074379d590368ebd92e SHA-1: 372261b2edd4fa4fd0a801e1a8f9360a7e08eafc SHA-256: 9bda1a888605c5befeeea2173b6c6f0e827b23f0ab0961c40af32faf538cab1f
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8891

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://krisoc.ru/uplcv?utm_term=real+liker+apk PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f07389baac---24237110150.pdfIn PDF document text
    • http://irollee.com/userfiles/file/6073409442.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/24518823696.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/munidosemetok.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6152df77d---vivisotoj.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/9648740985.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/segufekabikiwapabadep.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_310FADA4A8F2804D.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/54287038363.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613313cababb0---kopugudiroroga.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/numal.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e23e4bcfb4a795c0594b24e445a8ff0c/tupamajiv.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/45075931878.pdfIn PDF document text
    • https://tsegypt.com/file/topativot.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/paguwuzalobew.pdfIn PDF document text
    • https://oasis-travel.ro/files/mufiwanipibozivoket.pdfIn PDF document text
    • http://jjteriyaki.iorderfoods.com/uploads/files/98304485883.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6bvktv6mnbslni7vse93qevppi/rezadaz.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31238456448.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21574432890.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/fevozixumidi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632485066.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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