Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd3a57d22b55a6b…

MALICIOUS

PDF

84.1 KB Created: 2021-06-30 09:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ac33848f6aa44f75151584d10859611 SHA-1: e9047a8011db3045137241e5e09d8d4d0081efcc SHA-256: 6bd3a57d22b55a6b4fd937e8127977fe08ceb6c1aece55e167feec12d932a329
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The 'SE_INVOICE_LURE' heuristic and the presence of URLs related to 'vehicle delivery note' indicate a phishing pretext. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iimer9u8k5l8bhpfkjoed5a4qr/savometujozema.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tp4bm5q27chiejrqse7ckst14j/59004656756.pdf
    • http://gandolfiarchitetti.com/userfiles/files/17394012569.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9cbb95080ff7850b28654e777157ad8a/16005904495.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01fe21ac8---14142055609.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/77ir35ehsb9q4lrnt9tibfhdcp/20551388166.pdf
    • http://dietetyka-24.pl/images/files/rowefedonogalaniseb.pdf
    • http://vimar.ua/userfiles/files/10670694105.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d73f575f920---71457127003.pdf
    • https://questyme.com/userfiles/file/walerajogagamigu.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9cc5048b---gesokelorovobel.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ef28ea4c---gewizowuguxetone.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/72socf875n0a3gov7c6mnn1jsr/5686438334.pdf
    • http://seoulgreeter.com/userData/board/file/77894878112.pdf
    • http://stylowa-pss.pl/userfiles/file/kisuxegoginusaxopataxeji.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09e0b67fa---80982380026.pdf
    • https://gute-reise.ru/i/files/files/51752906396.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6odvh0fn642u6o7lq5tjg8en8p/tunisupibo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071236be5687---jotalizafedumujigemu.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c97af3211---72433063527.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/cicfmpcs117csek7tpfpjpo8iv/60310891308.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vehicle+delivery+note+template
    • 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_off0000e7a5.bin
0e4ce0795c1dcd383d8473d4e775ad3796699f911db808b2f3a0c2f573f1bee6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 16588 bytes
font_01_sfnt_off000112bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 16792 bytes
font_02_sfnt_off00012ad3.bin
068bcfd01dbfe1d537e37c4b8f77e8340eacef6ed0d36305c2f1fd00f870ab81
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 10760 bytes