Malicious PDF — malware analysis report

Static analysis result for SHA-256 b270b37b4113ff7a…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 06:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da76fb7c78934fd1a88ada873cead7d5 SHA-1: aea498f579f90f04fb1ee836e63465c18a47e092 SHA-256: b270b37b4113ff7a230c2e76e40ce50686a97bdae4a904abffa3ea4983e8c487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's part of a larger attack chain, potentially involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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/1608074ab9dd30---5914062644.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f32a1d553---tererin.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/522cfe4a8049d3b389b7dbe6953425aa/rimivokukoxe.pdf
    • http://abwingsbuffalo.com/uploads/files/16783051866.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a73e32c4---gijixiwib.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/823ba9db1950685f985499407e66b8b0/94039076506.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1305ee14---puxusekoliruravezif.pdf
    • http://baigeleather.com/userfiles/file/gelofafobogonukumu.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3b667a60f208344de32a7c8039d7c075/21763156266.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3k9ie762p9l9f7q9rn3thuqjr4/runojiguzu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec86a94d4---nomofelojabiful.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/12bc6a8f389235b1671559a616249a28/35642020897.pdf
    • http://aweibel.com/Photo/file/31893252145.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c433b9488d1a7cb427e63cd67349264c/zigezalutudovimuwetov.pdf
    • https://vansuloi.com/uploads/userfiles/file/91494593438.pdf
    • https://arichaindia.com/userfiles/file/vemijiporipadogor.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6263206b2---bogegijisew.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/04cdcf040f943c54a63ff3d135d6eb7b/bopimu.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812b6f4ea41---4328625252.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/46e6390424de8606f760732d309c0284/dumujudoluvewunar.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/lesuzinuxamotivagipuw.pdf
    • http://desagresbrts.com/clients/34568/File/43236274929.pdf
    • http://filtrydokoparek.pl/img/all/47209676644.pdf
    • http://suseefinance.com/userfiles/file/pabivorenilabo.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9ocr1tp33rhubd254mt8e4bmv5/motisesesezorasakulujubo.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180f174aa9---69911280605.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/jg7m6u21bpqqm82ruk8iomm8p1/41684726163.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rodgers+and+woodley
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 16792 bytes
font_01_sfnt_off00011f1c.bin
b2f2530621b2ae4629918ac0bab8247819e2c952d13274ef609765e8206caa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 10480 bytes
font_02_sfnt_off000136dc.bin
dd4b673c720e255e5ee1cfe7105f6db05491b5b5b3fe01b79a81c4b9cf2055f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 18288 bytes

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