Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3427f5350f831a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 19:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 870bf4eade07ee451b286c157148c67a SHA-1: 13e1e19573bbe0be6754ca44b914ce1431d36b75 SHA-256: 3c3427f5350f831ac96d181805b2ad2032b1dd13d34c6dbbb696896a4496ece6
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or compromised hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics further supports this, indicating the document's intent to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://wawabed.pl/uploads/userfiles/file/92185413405.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2hetc5m9jdabiemh69bnc52rt3/98652444844.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/27626788473.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/foxadurenivexexa.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/xudulomifogasavotepom.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836b1266677---41494429033.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/zavas.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b8a0c68d---debibapirex.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/tuzodazelevem.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/28612659633.pdfIn PDF document text
    • http://climtech.com/files/files/bekixulunokuzokorexa.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/vogeli.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3844bf723fbd1e8f0b02798f985848ec/27340413249.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7b501ab0f---725159789.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7ae41b1a8ef07863e0c9a26a4401966d/xorijawofiredaba.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/nojiwewitegutov.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/abf5d02abff58d699f705dfb592fcf3d/tajiraxujibegakozobobipir.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d30e53a936b5cd431a40e62181a114d2/zodusek.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jozujevuzipipiwutupemiva.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ed506a09---49931812774.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612176aa8e641---kadefiwojekuzi.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/takufamale.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160737a1f64fce---wasirunojegatubemuzan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sheathed+bacteria+pdfPDF 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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 10496 bytes
SHA-256: f55363e50ac8065670792d5e958b0bb653902a30d7c9b862d9f6e41d2f6ff33f
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16956 bytes
SHA-256: 9cae0e48f62d4e03b1962469d2ab1cc73d875227d1742bc82a3f217299d59fb9