Malicious PDF — malware analysis report

Static analysis result for SHA-256 24467b7cefb36b1f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 01:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc2b98ca6afa95791fa9a73b872f7ca3 SHA-1: 15b643de32d4e850b798d90517d4839ab86f6b8c SHA-256: 24467b7cefb36b1f8e3d8d742cc1de5cadede92465eb7be773cff1d426dcc642
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pelesiuvalymas.lt/i/File/nowipejidafon.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aea184d4854a912770be15876e887f1d/jesodetisolubokelem.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/940b6fd6472bae327cc57d45c83f0d9a/nizejenulusobomufuzu.pdf
    • https://essaidafm.com/uploads/FCK_files/file/2162774405.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4334f2aa---21832728387.pdf
    • http://tipsclubcr.com/campannas/file/45069720095.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/74695724092.pdf
    • http://asja-doll.ru/userfiles/file/3565506253.pdf
    • https://guruamardaspublicschool.com/userfiles/files/gomegexataseliwaxezo.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigunog.pdf
    • http://unicorn-furnitures.com/d/files/jotixogomabeximoxukedi.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/05a79e3dc52a7d17c11d74130132a8fe/13676391431.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41491b0ae---naminisekimom.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f39d5f38b59---62320556842.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e8812711f---lavawukifikupijubuwase.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffc761ab5---36119683128.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3492806263ad2fec2703e40078d76408/54968030924.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8d3d9fa2b21f96cd15e7b0a09a5cc9df/71784917797.pdf
    • https://thebookonpersonaltransformation.com/FCKeditor/file/wakigob.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f925860950b0bbd1e9d166b3e7fc34d3/rarosegubasazaruxe.pdf
    • http://bobmeetin.com/media/galleries/files/tedapitaposigev.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10495587417.pdf
    • http://volamtuyetthe.com/userfiles/file/vosanu.pdf
    • http://el-system.jp/uploads/2012/files/3932837065.pdf
    • http://jfac.kr/ckfinder/userfiles/files/xakaxodevegikutagelenex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=memorama+de+figuras+geometricas+para+imprimir+pdf
    • 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_off0000dd08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
font_01_sfnt_off0000f51a.bin
988d52a75b89f70e41a8acef9ec8213d1605a9077c013db0675b527c5c6d013d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 19296 bytes
font_02_sfnt_off0001266f.bin
33edd6d823126771d0d4aafad11057b1522e89d54df90854bdb5c298b399ded5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 10904 bytes