Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a00105fcb3f819a…

MALICIOUS

PDF

86.7 KB Created: 2021-08-19 10:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 538a28e266a0b47ba2cc54206b40b76d SHA-1: 44276d30af2de70a8fb0b35d4abf5a14323bbb7b SHA-256: 6a00105fcb3f819a0fb12c7fa2c9dac87091f8a92e74f0299fa35bd838d4b65f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or redirect to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2158d60237---55424627097.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a7b80e4aade3f6c7ab0cf867a5193df8/98120453726.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8f7d808a2bb3789f7809372819c734a8/57749245591.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/numazuwabu.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/rozivuzu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/bakixusewopuroxir.pdfIn PDF document text
    • http://centronegozi.com/public/garutitekexuzoberogag.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/xipivemopa.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160df02b10156a---xivav.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/10500059859.pdfIn PDF document text
    • http://www.bash.cl/media/file/mogejodipiluxi.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/29302829499.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e08dee80bd391243efd8b7b902a1ed17/lemegefibewun.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb52aa476---68143279165.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/64100494508.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b7e4f6808a74d4e37fb15832325d2a26/bekemomaza.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e5eb0f3d---21178251897.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/minikapikisagupi.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/dakimojuweti.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/16668999747.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/23431274250.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf84916928---76164334416.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/23407124920.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/29306324159.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/74398234643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+conseguir+robux+de+gra%C3%A7a+2020PDF 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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 19364 bytes
SHA-256: f79393d60a2239ba172890aa447b599cf08355f607e168535b36d9b9e65c6244
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 11384 bytes
SHA-256: 0a81b2699fe4d70a4fb7d180c2074ed429bea4be5e4d929b1cd347a73c2256c5