Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e08f61f7e34d6c…

MALICIOUS

PDF

89.0 KB Created: 2021-07-26 11:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2349eba145886bea34af9829eb3f29d7 SHA-1: be832fcec84da5b632034a41c1ccca1f2ecbcd2d SHA-256: a1e08f61f7e34d6cf03cb984ba0c7af8e4bfc8c42f4924d2404584b6e04237d5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/60f9467aa90228c10f75f382a66af9e9/23296784268.pdf In PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/bf933a3f76bc6b4a31dca837174cbde2/20945207442.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b16toeqf8bor8imoj3babgcdr3/70191946144.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/fupir.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/75179654495.pdfIn PDF document text
    • https://x-software.cz/data/file/bubazonifufura.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a8e987523---97476904358.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/dufatuxovotatovawezujivef.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4ccd9cf5---lenaridipug.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/zigarekuteketasof.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b16661c9---xedofixetuwup.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/68298300512.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/81619222073.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780e488375b---11299664021.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40f06b1b66---gewinebex.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/35959653124.pdfIn PDF document text
    • http://klefmarken.se/upload/file/18115983844.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0e51e1ac---47820081350.pdfIn PDF document text
    • http://slsnn.ru/content/file/rotusobu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ffdbb57c73fd2b6f09baf9fa3f3f5169/pefuvuwejitun.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19f5baa53---wavowanijazal.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/82726898986.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02f5c26d53---58383263270.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/ruzoxemaf.pdfIn PDF document text
    • http://bienbao.net/uploads/files/88386328581.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/11118516118.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dajaxatijagikebovapexapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+kraftmaid+starter+moldingPDF 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_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10868 bytes
SHA-256: f54b22fc5388f2e0495cd13ba1d4254b5b2fad89b027f0cfddc957f2d700dd55
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 17512 bytes
SHA-256: 2f8a634b22fe730d924b9bc097301ac4152cdc14338c2dd10f532dec10baf821

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