Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e40cd2a47b4bb76…

MALICIOUS

PDF

74.8 KB Created: 2021-06-25 12:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1d4b3ae275513fdf5be537b577b9772 SHA-1: fe172ca050b379bcbca6045f06d4e8647fe5fe1e SHA-256: 3e40cd2a47b4bb769d3bda7667f2f02e53ab964bfc734b718c4c176bd575c884
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.hangmandigital.com/files/file/bovijege.pdf
    • http://atut-biuro.com/uploaded/file/94277922231.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf20c32797---tolegorifadenapiwafovolut.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/02b1cee8b6d683f9b0286dfffc284baa/57620068996.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/96607262113.pdf
    • http://tlxzkj.com/uploads/file/171813531792.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1e1b69a---10116447250.pdf
    • http://solamsys.com/userData/board/file/bimalep.pdf
    • https://fruitssupplier.com/app/webroot/img/files/3967417229.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/11282933923.pdf
    • https://weeb.nu/userfiles/file/34917315402.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb50c9bc8---darareduxadetenogorufe.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5v5a586llstdlatn7erk9t9r6/17845251188.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k50r7dsoal1m8beahh1j2l9rpf/32336428627.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce24bb3513a---jinamuliburulinake.pdf
    • http://bioscipublisher.com/files/upfiles/file/67087284361.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+rotate+a+pdf+file+and+save+it+that+way
    • 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_off0000c3ff.bin
b2f3c7b4b81d3ce97f5a1ed6cc89bebf60876897274de3e436c8509786440615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 16016 bytes
font_01_sfnt_off0000ed55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
font_02_sfnt_off0001056c.bin
9c999403f9bb55405660515072590048c29e3d12e1d7630b8ef5b56bd35a67dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10852 bytes

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