Malicious PDF — malware analysis report

Static analysis result for SHA-256 337ce3cc94780d4e…

MALICIOUS

PDF

87.7 KB Created: 2021-08-06 16:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c10dc439eedf7c7b9cfa371090386c42 SHA-1: 1ce34543779eb8ced89bfd741b02159a29ed38a2 SHA-256: 337ce3cc94780d4ef067a9bf566dbf716e6bbd9242e833452918ab35e30e1591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded links align with techniques used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://vom-ragnaroek.de/uploads/file/83488739787.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9f6cb9524---86845500186.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/6229829311.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/73859023818.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759b61886f---71005338918.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1a8a06d0---jukemizomabixavabimasube.pdfIn PDF document text
    • http://muszempilla.com/files/file/kikol.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e79c23c088dc6b38101df62e341e8d0d/furoroxazuzukibep.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e88044e2---2561796830.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c0cceae81---45816312112.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f2f02b31b985a6b01f355df9d6e7d1b1/jopulugadonazikex.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/lizogazimijikededobuvur.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/57830696007.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/939cb77aeaaad615ac59ac44a437949a/55214547668.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/200664062fb33f9b9bbaaa2873f5196a/salebetagab.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/72250009601.pdfIn PDF document text
    • https://penal-garazh.ru/files/nowaw.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/36356963396.pdfIn PDF document text
    • https://angkagenap.com/contents//files/61809062774.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/2cf80c250b629501d154ea952027effb/zoxajamifamatomelanad.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/28912978885.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/zemawisikaxok.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/76971219918.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/76275834188.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/94702150750.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/10717526943.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/wewovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=springboard+close+reading+workshop+grade+11+answer+keyPDF 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_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 11252 bytes
SHA-256: 4a2294b6f480a9ddaed0f36fb794dc962a1c9b6a1f5c0683c4225985b18b4900
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 17040 bytes
SHA-256: 22f60a9714ab5ae7b981439797e52884e4e379735bfa18e9d08f09d22f8944f7

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