Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c3c683fa8d631a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 07:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d38d0dce01e599d2995b98a25cb0f2f SHA-1: 3a9c94eeb09202fb194229fab9827b0bef8deaa0 SHA-256: 99c3c683fa8d631ab98f522f95de7077ce99fabec81e5369fb818fcaadfa8110
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classification and ClamAV. It contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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) 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 http://nowyhotelik.pl/userfiles/file/70376925027.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486e2461fe---fukoxakezabaxabezaf.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/juwozitekomido.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f361a5bc584---2678924644.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba228c5f00---jilaxa.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jabudadadajojigag.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/39320353462.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66fee7881c---pewezusos.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/aaa3ce106ef5f8e56d64dc32580b36ca/19756402614.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/c89b6c282b67121b9d922d3646647cc4/makununijaxidelemujudowep.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/reviravilubapusononilid.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fcfb0d0cd---burizimekegeno.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/lezesopatowutuwubat.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7f1427169cf963eee2edb7f1f7f905e9/84516466105.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d5635035---tedumaxuvumewebunutameli.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/rufipupamedusepanezukaj.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbaf7c53fb---dixuxekib.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/af1cad4d8d2bd09053d5db47e01fd6ef/20995598584.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/385a263537cf21d0de64f689c6935ac1/17678078004.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ed1ef381---13175367244.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b586139a17e---49257720383.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/43298067790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=emergency+preparedness+pdf+boy+scoutsPDF 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_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 11160 bytes
SHA-256: 58c21e6b80a812ad442a0f0ef880e00667ecee05b6d1293f59eaaae690f06133
font_01_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13538 18004 bytes
SHA-256: d2fa4663f193f52ab9d389b27b08bef6c369fd601265beb5a5d3c0415f482f92

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