Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f4ef3cf5d68037…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 06:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 691a2dbd77bd0d548d613a1bcd098f71 SHA-1: d930bee439118e6a0a3b7dc4d0d60f490e15148c SHA-256: 99f4ef3cf5d680371816aa32c49080478fe0ea980103754d35f0402b4f01fa46
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d4ab58b0185a87e7ae17c5ab2b4e3fae/63738300049.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o03l2u04u1ctdno1cm03v2ibi3/pojujom.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2c1r56089o6rcdslraore0p9i7/sanorobeji.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/80076893370.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3a1e4f377540446b489e4149e7922aea/11076253748.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/ratexonufegala.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/caf54361921fc44065d2220223ac3784/61778064107.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f680fe3bbd2---viwokibejedofewakobuzu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/de7f37ddb44d1ad66c8c0e77ce80564f/26299950710.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/231336745.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8208032210.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2af5083d6d---85536918929.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/77d21bfdf1aced594dce6b48dacfa5fd/nizevanifani.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f48614d16f18a201d151f9e95150e7fd/pewegon.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/56879423293.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91d8654c86---53623654950.pdfIn PDF document text
    • https://hoalavender.net/upload/files/67057131307.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/fubewojuxi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/rajimizuxezanege.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/41895447161.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/ruvalotamelofu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/18ce5416cb27740b21e039f57c0ff184/47372574678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pro+warm+thermostat+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_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 18436 bytes
SHA-256: 201e4a6b3d717f4a1d1b2597111f6018f8f31910c332844e308fef4387d534cf
font_01_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 10468 bytes
SHA-256: 5647c020ea00db3b13456fb9a7116f5281b9dcc2029367e9bf38fdb5a720d069

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