Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c12bfdb4e56065…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 02:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 015384973ab7111351aa7a49eec9b825 SHA-1: c4e8a9b2f95b3d86c2a2bb7259ee21399426697a SHA-256: 31c12bfdb4e560656f8bf7761640ad494aa139ae4726846480bd357795369411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6f5472f0091061fab6cfc6183d8aa922/3357898250.pdf In PDF document text
    • http://kangs78.com/clients/66216/File/vubewo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/24780308346.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1ec51129---fozizeleduduzisovewuva.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7c59375aae9feaf12c2b17446fe3b91d/78121401375.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/39494153550.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/aefbc4fc52a5237cf4044faa7a36b77e/42724124026.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f309f53---83794024659.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c51352f70---tusozoguzazov.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/sunelurup.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6f249b0c---91370106052.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/bulevatuvoreziwonaluruji.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/dunexudikamijuk.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//78156340079.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kizovirezozu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a041a4c6578---75487813354.pdfIn PDF document text
    • http://amandamaitland.com/images/file/16248942865.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/280ce79bf51a9e9f6369a851ad163fbb/sojafukabofuw.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad619bc3bb---39691080866.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bebeverokib.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ceuros8ao7d5u4hs7hqecksur1/pazodop.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/17301105469.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/82c5d651aa6efd94298faa3edd3163a3/96514427043.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607827f11abfc---zomixelukiritorewax.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/49983924541.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc24997584---36244635181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=account+manager+interview+questions+and+answers+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_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 11296 bytes
SHA-256: 5d466a1bf7f58e273a4fec3d0de93d85802236fc2ef7e287a0da4f00535bc9d6
font_02_sfnt_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 17720 bytes
SHA-256: 9c1ca71dd60c46674765e017a198430e4623f3f2bcd333e1614172d704bef6a8