Malicious PDF — malware analysis report

Static analysis result for SHA-256 37996e44b91a8aee…

MALICIOUS

PDF

110.1 KB Created: 2021-08-04 21:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9bd057f1ae60e5f78c5676bad8d2ee7 SHA-1: d482d96a1e8824e06e3b3c1774ebbb20fb7113d6 SHA-256: 37996e44b91a8aee5441a6209f0c8ed39189c8b8c3b4e96d0d196b06439db967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=dibujando+la+cabeza+y+el+cuerpo+humano+pdf PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89574b351---87768574391.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3035592cde9886cb391aa5abb8ac910d/lumijejegovijavalud.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/wilewitufelinojuva.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2cf0c9ef5a5e3c73f53c67c1bb26fcb6/mogavakutamojifowibukize.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/67191085305.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e56c7b1c---7017937238.pdfIn PDF document text
    • http://findusafranchise.com/files/files/kufedofi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/22077902204.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/dufonoge.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f81eddb6ce7f06b141207540376c4e66/ruzusuziv.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78718b65b9---32128034264.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/renovimabu.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/fudexazefuvupitagumo.pdfIn PDF document text
    • http://iphysiology.ru/upload/derajusikekudorunagevun.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/13p8trqskqsssjc5igvj2ecov4/bogikabegoxuwadodunere.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/23915293228.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc269d4331---gutojese.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/tetupikidabe.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/75759386338.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/gasuj.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aa6539932f9cc3c8a292fb396fc81fdc/2454899962.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/23851075459.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/8824da6f5625bf72ac46387e07f31db0/nixuro.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd261364d---64350865783.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/15509873241.pdfIn PDF document text
    • 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_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 21492 bytes
SHA-256: 61f4b24ce357e6f07cea9b7c5a38cf53357876a347232a98d701681c8630d210
font_01_sfnt_off000178dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DC 11164 bytes
SHA-256: ee2392a8d6c2fa318f3373e7130c8807f94e92007e132cc14dac9eed4e05ed91
font_02_sfnt_off0001927e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1927E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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