Malicious PDF — malware analysis report

Static analysis result for SHA-256 119e42424a88d0fa…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 21:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f563c261369b9f3b6f0c155e00f38b8d SHA-1: fc86e10fa4877d68d4d5ea786ec822ae6f06b6bc SHA-256: 119e42424a88d0fa772230f3e82dbdabc4d8fd2ff6baf1211dbb8f3149a7891f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://equimat-cheval.fr/file/salepejikibo.pdf
    • http://jiangsutravel.kr/userfiles/files/20210626_104129.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca3fb1de2---99392240795.pdf
    • https://living-stone.lu/userfiles/files/funadoguji.pdf
    • http://agcslohian.com/userfiles/file/80460359448.pdf
    • http://xinshifm.com/userfiles/file/radavunemelanajaxumozogom.pdf
    • http://stin-verdon.fr/assets/Image//files/getiduzizesedemugopisumu.pdf
    • https://pavillonwohlen.ch/userfiles/files/16666421172.pdf
    • http://grandinhr.eu/images/user/file/niposezugaripemuses.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210719_074A189B7DFE8191.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/756423cd38fdbef31a2252169a62e241/folixomexenomulopegivawu.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/33801614061.pdf
    • http://zentrumok.com/userfile/files/mobodiguxizomofegatewavug.pdf
    • http://platcometals.com/images/file/99513909207.pdf
    • http://noahsmarinesurveyors.ca/userfiles/file/89584644457.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7fp0h8qsigrtcs06mshnd7936b/75448073591.pdf
    • http://tuzvedo.hu/elemek/file/vodutaniwubi.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/53303144515.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833b208c27---pavalefokoxafebogisol.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6bc8b1d8---62430875462.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/171a6d3ed3f3f74b103f98b4921e613d/56668272862.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3483d55777---nugujifepafixo.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/bafum.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/89250103526.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=motion+pro+tire+gauge+manual
    • 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_off0000c24b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 16792 bytes
font_01_sfnt_off0000da62.bin
92c6a9f5c01f73ec8c741f0fd9e957776b670b391f8059950040123da7a2a402
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10520 bytes
font_02_sfnt_off0000f24a.bin
5a792d002d4f35bf29a5e82721c5c20d3551fdd5731ed57151ce1ac16fb76ed1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16588 bytes