Malicious PDF — malware analysis report

Static analysis result for SHA-256 a732a830d26c3c22…

MALICIOUS

PDF

85.5 KB Created: 2021-08-27 09:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 580ab12592bbad3d19a24c5da28fa591 SHA-1: e750f74703233338d6945d794bf08fbc8ca76379 SHA-256: a732a830d26c3c22994ed6641d8e5116ef6d3e74aa0ba66efd98f75867a39bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://skiflogistics.ru/userfiles/file/gumawibupozugovizoza.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942fdc8f34b---19456287331.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/42847785743.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113fe9136f33---3419668176.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b3110ef47165e544d7f71bdf8138be4e/vutewikaxatajepasegagarut.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/38618398394.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3548391af1e788faa8074f538fa40dad/gabezufo.pdfIn PDF document text
    • http://hrudolf.com/userfiles/97937875666.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mvnq7lmlvn3v579q794g1ceih9/68129774991.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ninobalonupalul.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/977e275cf4f6708726b8266c7a59cb94/48767910345.pdfIn PDF document text
    • http://gibisch.info/files/files/naxumomumimuzaxixevulonez.pdfIn PDF document text
    • https://kham.vn/userfiles/file/24424734696.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1d4780phgmhvj2k6g3nj9gmt47/8837320048.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1t3j6t4rvh3o0qfcuj7n9mslk7/wogapemopugobamobemimime.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/devenogogudif.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/67360515918.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jijupoliki.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f142b301688---15799230898.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/32185997943.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b281a8b5d89---fuxivedefetomadozawebik.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2053fae53bc97ca70ad7e29ceaeca89e/falaxonelalibazenane.pdfIn PDF document text
    • https://htchninc.com/d/files/pasesagozexobuzufov.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/gubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=run+with+the+wolfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16756 bytes
SHA-256: c4515cb1d11703c97f872bd6af0b5b8b48f4a06aacb0bd911b10cca8a1e64762
font_01_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 10112 bytes
SHA-256: 3e7fcdeb887f4fe8b398b8ebab4bb5747fb4da3dd57cb974d45e68c290c4d193
font_02_sfnt_off0001303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1