Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff05683ecb6b4f49…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 22:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f62801eebbef4ac95d41887178ebc24b SHA-1: 9e0f9ab3a8cfb04685019ea7022342d3b53a8874 SHA-256: ff05683ecb6b4f496612f564b1534dd145718d4f1e1aa347f0a2fa12b9c28105
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used for SEO manipulation or to distribute further malware. The presence of a callback lure heuristic also suggests a potential phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://angkoronetour.com/userfiles/file/deritebafu.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/295eeb120146a0c38f34246f16410363/59070078056.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/zenofimo.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gobik.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e08d0f7a---49973398551.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501211524879975.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa3cef533---2600386745.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8aea0bbe5---66558699286.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/be33bbf3fb1f73f6d20a6e1fb14216fc/fuwefemasevewaj.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jjrb00p34suf9tsvdbslr7c0j0/11233522837.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d239bb7152d2f061a143df4e1d3e00f6/kinozujolejapumo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba19e538e9d---kofas.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/nepel.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b7a84dbd483c610dd789ba21ae3d84a8/33380206947.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pgo9rbmnk7ifajhce6to86d3rm/dozavurokalulano.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b1bfc4d57---83284739136.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f4f064b3---xagubofepilaf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8ecd24cbf527dd64d64f2243857d6981/49585085475.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12bec0e21---revimubod.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/polafegezivonut.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c7b7aa3f8dd6bd6dc2fe31117bebbb59/rekof.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/pipanodikovotefovora.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e378440e6---85131653556.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fd0a338f---65101333850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dacor+owners+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 18136 bytes
SHA-256: db90f467c52d568edfda4842aa6670c9c3b49b46d60b0077d5bd628c94c261ba
font_01_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10388 bytes
SHA-256: 915a883c68d050a3f4f80ed309443554b4e73115e098e8442321eb9d0e0c7e85
font_02_sfnt_off00013990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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