Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eae3de074d115e…

MALICIOUS

PDF

84.6 KB Created: 2021-08-31 08:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ee8547defba328e5a01f2c36e7f3bae SHA-1: dbf6352229df75b3aea186a35f6b0d718bf4fdb0 SHA-256: 17eae3de074d115e0ee4b16dfd907b110f744512d9eeba82462905db9ad522a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://synerhu.ru/uplcv?utm_term=month+and+a+half+hyphen PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3b21324b---dumanafod.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7439a3629---96284262741.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe29506749---1186691075.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b8988dd7942c6bdda5034a9fbca7c7ae/19307520577.pdfIn PDF document text
    • https://megashina24.ru/files/files/81240465467.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b345f715---pufapufubarewekixoxedatew.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/21875891258.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/fawakovejevibo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/gilezok.pdfIn PDF document text
    • http://distributoram.com/files/file/93264727123.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/edee0e8714b67f91e860c8a3782e9977/tipiwutebadovoka.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7d8f905---dikar.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xarefugebip.pdfIn PDF document text
    • https://ccskin.com/geektic/files/37842946220.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/boruvazumumodovoto.pdfIn PDF document text
    • https://landbar.com/upload/files/piruruwitajigevi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/simugitalilagona.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/lakulij.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15963211824.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/ece28671e219573217927960174b82b3/mixuravol.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a825ed37d53---58458496499.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d706ee41335---fubokumakemo.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/puzovibenovudax.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174a2d5775---zesabaxogijaludezaz.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 18412 bytes
SHA-256: 4ffdf1e69a29a3e780f301d7eb0bdb1b7b1bb7919c7372366c824481af3972ff
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 10344 bytes
SHA-256: cbb086ba4b3fcecec93a3e0dde846f0ce1aa563da37b227132cc1e8f8498bf3a

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