Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04878ca8c09d60…

MALICIOUS

PDF

84.2 KB Created: 2021-06-30 04:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 33ef170acc7a368d83cd41d3e9a9ff51 SHA-1: b63ca9c3c20155e97cdd9fbaedd269b5c8878510 SHA-256: 3f04878ca8c09d6092fe39578ab2bb9fbdbb78ce9df8393212a57b8c35706461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an effort to obscure the ultimate malicious destination. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chronocertif.com/userfiles/file/99895117.pdf In PDF document text
    • http://progfin.pl/userfiles/file/sivupepos.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/21654272589.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095b9e2afc8e---xibemukatubupazefofome.pdfIn PDF document text
    • http://sakem.org/userfiles/files/73437833256.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160891f1222d66---texezasaludaj.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/46933337708.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160764950d543e---30282543380.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/5735633904.pdfIn PDF document text
    • http://apcmagon.com/userfiles/vunupipi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/db08cccb79add867ecf9947fbb9a73ce/belamumakeboxotamojo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3b17d2bcdf30645de02f70f6ee7cc26d/jegalizutasilazuzov.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/69737165030.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/63ii2jl5q8qo6nbd8lvrn81016/felovo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b005833b1---mutufanuxasomedik.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/nejenisi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/17f0cc11158fbfcdd76e2d86e066e2fe/mufuworibuvokivevo.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/35252324299.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bddc460cda975fe8ba81cac58aa73441/xajojoxekefopewu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4f23e158fa5f0cbffdc706120835cbe2/52047032033.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7d58e4a4---voneruzowilamelojegimagad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+splash+potion+of+invisibility+in+minecraftPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 11236 bytes
SHA-256: 617fa1650e925c7741bd13c20e36bb49015c6b071e8cd375eb67036f1881d75d
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 17176 bytes
SHA-256: fdee6d5754b203b642d19331335187947cb4c2ac702f5b5aa01adff72ea25fb4

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