Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b4683ea5e68bb6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 06:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 929e7ca7bf3957b0bce35226376d7cea SHA-1: 1d3a218f861aaebb37a535e63e40f9166e969afe SHA-256: e5b4683ea5e68bb6a691edf2c5b2fae8aeacf0134699e2002507b98ba6c489f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=quickie+qm+710+manual PDF link annotation
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bc5814645dc93b65e8d8a8f36a952aeb/jiduxarizarutabuxuw.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f3c4ca0dda498d91b33a276c5bef6515/52464846541.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/76689739464.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3184b2b3---68614733649.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/93608099215.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077688f4207f---66709552176.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb98a2a2e---3557372877.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/57489615861.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9g0kcckad7f3d5du59221o9buo/lelunojijug.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/lozesa.pdfIn PDF document text
    • http://elpijisystem.com/file/jixiwobovunudubi.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/fijifatop.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/92642023011.pdfIn PDF document text
    • https://webmenuplus.com/images/file/90377400641.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/bt66rvtffddqad8no3q98ovcio/22927954064.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/runirebowigixifumurajibe.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kepulevifovulufimus.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44821315710.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/fanafadulexefasununelalak.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a9796de39ab36b534faee57f0d721472/2448414451.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/69000885429.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/dudasidejodotosijuxobo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1uirtnodh95lrtapr808ctt010/15083225713.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e9f38af---27529102175.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_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 17772 bytes
SHA-256: 5370cdba5cda5cb389194493550ce98b59f0a76dc249ad47b63fe0644925e63f
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10528 bytes
SHA-256: 0ddecade325ba22287dbf8bf4f637748ad728ac23eee749a877e32d4d0d6b63f

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