Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ee1c61432c8fb5…

MALICIOUS

PDF

63.7 KB Created: 2021-05-25 15:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db954827e7f5c869fd8453960eb3da10 SHA-1: d6e2a8c37b2dd0afa096f9e6ccca150070ec911c SHA-256: d7ee1c61432c8fb5bf8e1cbc98bafa2dde143aa6893269dba5c3d6bfa4b99ad9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

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 http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512104809493531.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2e4c1d8c---miwovajizorevege.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/09901b4aabb1a93a5f2fed3a398cd324/rozoxuganoloxebemorepa.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608320247ce37---ponipokefabudokusozixogir.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5088ecc9387ccafe8273404628d699a1/18438556315.pdf
    • http://apsons.eu/files/file/72255889318.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072597b29375---sudawub.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2e1c685d---13201164053.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608834052fa15---saneluxiwokoz.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffa951a64272785ee0b60a7fc5da1e0c/subanejosubir.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/jenenowikezobe.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607251482d7c6---83944015953.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076153f4b74b---66504415526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adt+safewatch+pro+2000+fc+code
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f5.bin
fb1fc4c71f182d87ff837f7960c8cac151432dd078f5ce4dde33cac8751ba18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5564 bytes

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