Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e216cfd4bcb078…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 18:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b84431d8a6e38ee927c77193b16eba SHA-1: 923777bd04e80c1807aff6aa17aa332ba88752d3 SHA-256: 40e216cfd4bcb078412a7016d6fd41d9dae56b8141a2bc40e749c1706787d240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the primary attack pattern involves redirecting users through these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=3+lines+story+in+english
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/67071699831.pdf
    • http://precisao.org/files/files/tolinugofasubenanasavo.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/rivikejim.pdf
    • http://okna-dvere-online.cz/media/upload/upload/file/nubojirigekepinadeneriva.pdf
    • http://chiari-web.com/ckfinder/optimist/files/19462085039.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356b1d90934---67574865922.pdf
    • http://ricarda-allegra.de/userfiles/file/wosonikesezuz.pdf
    • http://orem.mn/uploads/files/60025817715.pdf
    • https://alkoplast.rs/files/74744220620.pdf
    • http://cuoredicane.it/userfiles/files/81669372784.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/toxulazibira.pdf
    • http://gandolfiarchitetti.com/userfiles/files/vatotunusotuj.pdf
    • https://ringid.vn/ckfinder/userfiles/files/60860166486.pdf
    • https://maintogelonline2.bet/contents/files/gilewa.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161362062e278c---71603429081.pdf
    • https://f27szerviz.hu/upload/files/95669388208.pdf
    • https://hotelexpert.ro/uploads/files/wirukokegunofi.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a25cca35836e97a4baa1e21b72eb75a/kiveguguban.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/xigefaxebogatoleka.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/nosep.pdf
    • http://yuh-tarng.com/userfiles/file/zojavajo.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/37539713306.pdf
    • https://ascii.tn/web/cgi/file/50838495714.pdf
    • http://aesg2edcv.handylover.com/upload/files/48097483016.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_off0000b07d.bin
2ee294602576ec789e683eb84e36b66543f38aea627b96ec6c04d4c226a880d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB07D 15364 bytes
font_01_sfnt_off0000d760.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 16792 bytes
font_02_sfnt_off0000ef77.bin
312c4770cd4dd40691107388ef324331fd83615acbe1ae4ffdc159fe7bc04e0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 10416 bytes