Malicious PDF — malware analysis report

Static analysis result for SHA-256 c014fff85dd1adf0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 13:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 671fbcd37c84a20fd8d2f867005b859e SHA-1: 86c0ac1fc7fab77ad46a0c10e828b934a2e7a5b6 SHA-256: c014fff85dd1adf0d281a794d286b044eab85f0802d837a7e6b903fa888d63a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious content or phishing pages, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=production+planning+and+control+vijayaraghavan+pdf PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97e1dbf84---wewerubojeko.pdfIn PDF document text
    • http://lulanjina.net/upload/files/41335135139.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/fumujejilujonikigivem.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ljbk68cfqg6ps7smehg7smit1k/rukorafukoxulu.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084249700ddb---97789461040.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tutixudigudefuvevisat.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092aed483e96---lesupamuma.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/korejoluwuk.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/najof.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/95731036368.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080c68dd3a61---48810053326.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/givisodipo.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/ruvovogasot.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/kowufokerid.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/58081846251.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/7831281061.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/volejexodagepebimepo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161114982df6a0---65272554148.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/13480156899.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/90f4b5f0e8ac6e0ebeba7c4929100fbc/62581306471.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/sibifelukef.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/babenenudomid.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679d19ee2a---mujadexe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931ca36e3bb---70061181858.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 16536 bytes
SHA-256: 40bc338287962ead0cdca1afd8507f21fe7fe5ecdd5aa31daaa11d85c11ab220
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 11012 bytes
SHA-256: c7d80abe31dbd273c680ea6cd14f2f9c0d78900ff01cab27d16fb81ff96a7ea9

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