Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22959ecb8fbb22e…

MALICIOUS

PDF

75.0 KB Created: 2021-05-16 01:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de0371e34d157c68a5c26c07acc3f82 SHA-1: 9a176d93f9a29b0f8be5ffd09bea26b4f6fc90bc SHA-256: d22959ecb8fbb22eb9164cd93c5fef701beaff597f0f1ca3cb0380516ef34b38
154 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'Calisto 620 manual'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7777

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66a88cdb1---vonologixevufifutuvogaxu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a042cdc0146---19233819934.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1e43dbd903e0f9f4b5b7191ce1c28e51/zezegiwexi.pdf
    • http://krevue.cz/UserFiles/File/nawurafes.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3ff95c12b96822ddc5d631037d796a7/tepulefipuwiganalawadet.pdf
    • http://seabeachthailand.com/UserFiles/file/31754253684.pdf
    • http://spreewaldatelier.de/img/editor/file/37365628850.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b4159a90f3b008744ffaf7046d84ad02/bufijemulupugoputum.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609495d600196---xoxigokavatoduwazuxawoxu.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc43c8093---29189298208.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/dowubijugu.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f7ec7ff4---jokabotoze.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160794a3a452c0---88058043289.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086acfc0c43a---memufuzizitikizorede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=calisto+620+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin
6310c1b483dfdaee7e3f993b1a3dcb7b590a1e6c981c37c0f78649df29bb38d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5068 bytes
font_01_sfnt_off0000f8e6.bin
4bea4453790a6ea35936635744b076dfc3b71914726aca36e16900ff2e1c2ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 11308 bytes

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