Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f13e262692598b…

MALICIOUS

PDF

79.6 KB Created: 2021-06-19 18:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2138c123302fcab8cca2eac08abd84 SHA-1: 1b85c1b7f1b6551983a27eb468aaea89346fce53 SHA-256: e1f13e262692598b25fc7fcd5a64fa44109a80c9486cff788fa3a9fe5a3f10db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, appears to contain keywords related to media releases, potentially to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=falcon+and+winter+soldier+new+release+date
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/3va171kbpeng5nbstc1lff95m2/8809878304.pdf
    • https://edubox.mn/uploads/users/0/files/vuvulesokogo.pdf
    • http://nutronicltd.com/userfiles/file/torogufebox.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec1dc9d67---71299424999.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9ab2daac---fotajamibevumutirenotamin.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a3ba01eb713564c9825f9f429e05fb85/jujatulari.pdf
    • http://hongshengfish.com/uploadfiles/20210525/2105251514002714306v6w2rgf0vzm.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92ee541c42aef63c01208f38a19124c5/buzonur.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/1de9529897d220b096f517c14ca19167/widifegibat.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e803b7504a5efa83626baf7b7ababe53/raturun.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb163f374---zatolagagok.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb84ed16d36c57b21bd18610293b8809/8487201258.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844a5a5012---68136727310.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/80a371fe6be8349b5fa07f2b9692da86/worenosejaziwe.pdf
    • http://capmar.eu/userfiles/file/23162260141.pdf
    • http://ahlhy.com/uploads/file/030622216598.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/kapukirufewipoxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea02.bin
4a9a5d1245cc71679fe017ffca69230481fed3fcc5a3fbc0f07f3abdd1a9c7cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 4768 bytes
font_01_sfnt_off0000fa45.bin
8576c1f014c9d396a180fde127d7c239a784689a4c27ee015774ca335651fc7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11596 bytes
font_02_sfnt_off0001212b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 4324 bytes