Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0f2c2f97944181…

MALICIOUS

PDF

61.1 KB Created: 2021-05-16 16:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fe75ca43d4539779816ef9a42221262 SHA-1: 495bc10f5edc249e06cbe0f28bc2c13271927710 SHA-256: 3a0f2c2f979441813dfe1ddbe50c3a2451be58d7115d6f518bb9a9955b5b5463
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads, and ClamAV detected it as a phishing trojan. The document's structure and embedded URLs suggest it is designed to lure users to malicious sites. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3e9913bc---97827206360.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e37817ec316aae941a39ff897e04c2c7/12038849591.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/77ded5j60g8sjdn39g309lbdji/20136622482.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998e46800b3---22874663989.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e302d6de7e---92988320247.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f3e7ba80---18086523656.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46b5bb2ec---tibovimezevaxudera.pdf
    • http://allycatering.com/userfiles/59356351891.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3784d7d96---47607751991.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/16017f87d8cbd0f210aecfa84795de1a/gisavatofisipitudukidimep.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0e17ade8540f72f389d5b0f4a9560829/fefewugumezite.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/abcb98eeb57142b66543822e5f7fbf95/88061772967.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe83318acc---sarilonojufe.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2cc0d3d7---sotisadunugovep.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/41fd8b6e8987e91433497d7fcc786ca2/kevametubupomarazimiz.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fbns36o1b07526jlhghhrdc4t6/47006246597.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4c8d0a6219ca9761a90a77b1223665c2/sudefitonomomutudob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dota+2+auto+chess+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d887.bin
00f99806a7d3592a52c16061bdc39b0df56f131573ecee1cf87417dd303fa46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 5204 bytes

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