Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f06c5fe6041006…

MALICIOUS

PDF

62.3 KB Created: 2021-06-18 04:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04251e4df4f8db2d8e8cddd0bcbf232e SHA-1: bb4322e7bf4a284242e0c3f405318028d9a2834a SHA-256: 55f06c5fe6041006e8ef03381f36f94ef797957e0bf60395c5febc558e4211cb
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, a common technique for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eea2c6e3d---90722852545.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b652721b---giponijopomud.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04588e71c0---97689065443.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3750db57f283fbfaac715a3f70e84f4b/4910973204.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ql3if6jjh44ctp2l5kk0mad2m5/pexoxekopejitatijewa.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6rf9qdbkfl237eefhghdsadkv7/61910093061.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d81eac3b5c09b39beec66c09f05aa25b/zebogekubonu.pdf
    • https://aradovan.com/userfiles/file/74964733632.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7d5a2f6e---14469128498.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/24bc9a2c8c845fccdef9f53735cd914e/vibipudipiwi.pdf
    • https://pjkconstruction.ca/images/file/5515423500.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/561c6b53b6dbbda7a10d81b80e87e2c3/22866128386.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02426c0246---24706604867.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/06e0295375434ec8304b70994ccbae6c/wupesumo.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07697288d2---pegurokogajikedazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=remove+unused+apps+android
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e9.bin
090912fbc620f3c57a2698fbcc19ecdb3a344cc8a8f5dc0ffa205b8cdf0a77a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 4940 bytes

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