Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed95f2c8d6ac99bb…

MALICIOUS

PDF

69.1 KB Created: 2021-06-13 22:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f92601f44c78b773b4e557b1c07df87 SHA-1: 5fa62babea903f44e3b13c5c8518cb246a29068e SHA-256: ed95f2c8d6ac99bbfbe5ad8b454b227b48a62ef14115efb80693e3e4e362435a
154 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links are likely intended to redirect users to phishing or malware distribution sites. The PDF's structure and the presence of multiple external links strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9730

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://wastran.ru/uplcv?utm_term=247+spider+4+suit
    • http://2478.ru/admin/ckfinder/userfiles/files/lumurupomozegatabesadu.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/34792354151.pdf
    • https://fizjolech.pl/userfiles/file/34772488164.pdf
    • http://ehomeforeclosure.org/images/file/91767978371.pdf
    • http://frezerovka.by/images/fxeditor/file/59315283434.pdf
    • http://appletechsolutions.com/userfiles/file/xasad.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b81e83001---22426363161.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b75c6acce7e943e67412e3e54dde6cdd/38349852570.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/dutopelumilupenu.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/99f516be7d4fbf0b5f313254acf1fe09/kewur.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/99439361954.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079720099edc---48583175866.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/01036dbb7a44da72a7d0802e1df4fc81/50933128102.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6b5a0408---zotoson.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f45ea4d7---79402238940.pdf
    • http://frezerovka.by/images/fxeditor/file/1120362046.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc806e60c---gupojunesike.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/34710ac5a833533bfe84aa919795517f/53291410579.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7907749528e58616f5a4d73df016d40c/jojonafisesotijufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee41.bin
49e47022a9a7261bb1beaefbdaa69376f6a81247cec7b96701a6353dfabfb27f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 4916 bytes

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