Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bfdcc28fb60b76…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 03:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f9c44a39fed1d66555964a2328d224a SHA-1: 49fc48b21aeee4c796e44f5eb693de0278f65467 SHA-256: 36bfdcc28fb60b7613b99e959007eef4f5fe00ed27bb6436216dc0559a3eba8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure strongly suggest it is designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://irlanc.ru/uplcv?utm_term=fixed+interval+reinforcement+schedule PDF link annotation
    • https://folklorebridge.eu/uploads/pictures/files/67528999423.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/26d173bcd587306a384cb40ee0b3e4a1/66142423871.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/053cb8b9bae33244babd5b03e78ff4da/90949807939.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqasfra059b2gj77h4urbdg8ue/30354303554.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9rnl7dg3dbhncdtuml1obsd6ml/nenebuvib.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f7a51c770b48909b8bc1fb6b40a5bf1b/pomaxivexiziliwutup.pdfIn PDF document text
    • https://777mto.com/contents//files/fovasatosefuwokutirul.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160812ecd4b618---jepawonakuferodatisobik.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/51160132506.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6f67c694c11703f4e17f57ce0314fab2/subamar.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3c9f1c99---ginejigejelobefajizogukez.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/36090321887.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210630_06C47FCAABA29124.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/93146903445.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/gomojofavebibet.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/33c5c1aa70a337bd7e60a1299eea3bb8/guranijajufufigepo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9fe3ce4f---54824466521.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0ioso99g2q9q1fjqu0e7je301g/naxalemamafilopazegut.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a521c3fe---kafurevixiwur.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aefe3e1e4---wafobopif.pdfIn PDF document text
    • http://aimic.com/userfiles/file/rarajiziwokitusijefekages.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dejifelitoxiliv.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/2035771418.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778633b018---kuxagi.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/degebuvujomaj.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sibubinusowifez.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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 10988 bytes
SHA-256: 31ea108c97920a489fe4d270ef175848f8a5b273b5d3329abd7ca8ebe8e2e7e2
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16992 bytes
SHA-256: a7f0c6265088f69fd2311568d3d39958a0b56b02361082c48e386f3825817dad

Open this report in the interactive analyzer, or submit your own file for analysis.