Malicious PDF — malware analysis report

Static analysis result for SHA-256 29575866923eff79…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 20:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5f776c9bd68c15bd9117fea9a375d45 SHA-1: e768c81c07f5f871108d2181662a00f2ea042e3a SHA-256: 29575866923eff79eefbaa0c42c38cf64285629b4e44b81a7754bfc90ed6871a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and the use of compromised CMS upload links are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5ac638a---gufebokikuvujolisofi.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/51898901806.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/46629942629.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630732100.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/06044bc0634b609507f49a01a94963a5/zapodowubebujubowe.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/98895992911.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/gabupunovomilabo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/wapasovibadoruw.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/dimuxomibomikezulep.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/837b265df9050b6bbb19a2d979d879b2/sevomomokavisotigemakurok.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/51645259113.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/xufev.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2a741086---43877289501.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/95889448743.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xexajejobe.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/1307495422.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pejafifafesuligufazibafu.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/wonodusivipegagud.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupewin.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///wuzabuditivuteki.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/19815662338.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/seximeto.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/bosudeseradebumexonek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=live+mobile+number+tracker+app+downloadPDF 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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 19192 bytes
SHA-256: 3c21e709bde5b1a9639d8b4a678d3adb06b39aa15522e8a5dea77d896b0fbfec
font_01_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 10948 bytes
SHA-256: 7cc58417c6641e5915becd48e16a2aa92b5f5c5b9055e609b7fd93a884334ef1