Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e7a098d0d9eafb…

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 07:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ed9ac357df8100fc78f2dc2da79248c SHA-1: 5ed5a00c77bf4b5936d8f720096e772767dc0352 SHA-256: 68e7a098d0d9eafbd4fde95c88f2f34bc4505670a48c52faad471e7e8aa5a6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://usdcp.jp/user_data/userfiles/files/20788495221.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb69e429af3613444e526ce291d72ad4/62091233351.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/56f14bfe78fda13930ee9a6197ad3a23/87711281345.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d87cac6a5---65472830052.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/75qf5brimnf9312oihh7nfo04v/barose.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3e5034f93881d6e05a8efcad4dc1410d/99926339429.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1873839080341c5ef7b9e51134d52c87/62424744907.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a6cedd6a---poreponubogev.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e13b5723---44736969379.pdf
    • http://tlxzkj.com/uploads/file/181239259405.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40d3122f4b---59134468175.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fae158a5a---sajelirupupav.pdf
    • https://alakharia.com/public_html/userfiles/file/62133357452.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/wizitevowuxazefef.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/a1e2a99f6f92cc3e55fb88b78af71a02/futufolo.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b413d2db57aa4221d5fb4a57eeef161d/famajuroleminigeli.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764db2db607---46720847183.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b9cb918a15210f0b5598c6649bf6f2a2/gisojajuzudasemipiforigab.pdf
    • https://mimpishio2.net/contents//files/76287843842.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad260061f---xuwunijela.pdf
    • http://apcmagon.com/userfiles/pogod.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53ca822d2---sijerinewobevodaji.pdf
    • https://cleaner.pl/userfiles/file/litibesekalomarelar.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cab03d66f88---8610117650.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hai0ojkk5c697jih58al2o9215/243287399.pdf
    • http://assushop.com/userfiles/assushop.com/file/gopoxuzetuge.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=teens+being+sexy
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ed9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16792 bytes
font_01_sfnt_off000126ea.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16312 bytes
font_02_sfnt_off00013cf1.bin
0aa7ceddd978b5e05332f6648126438196dbdc3740ca86f8c63b244a83bcbb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 18432 bytes
font_03_sfnt_off00016d36.bin
5fa352e1e894e40a99b52282111b8ed58c3facfac3bb3422d04efd1c99d621c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D36 10076 bytes

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