Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb4117773936000…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 01:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bff10aad6538216d6ed1fb45fe06a161 SHA-1: 75446d9ab547876505f37927dbf71df6ccbd4d6a SHA-256: eeb41177739360007a57ae7be9d3acb1adb4d810b0ac64a8b53c828a5fb69304
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URI heuristics further supports this conclusion.

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://cructi.ru/uplcv?utm_term=es+file+premium PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/pazoxit.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/31877531890.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/kuwonofezelusi.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fixugabegobesaxaxuzur.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/gukofepazenofotag.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pu374sun4215j1mstdju603hs7/vuzodiporajeluvasajax.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16311623181580063485.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3f16bbbd0f37bc7c8b837867418dd390/gogudexewe.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/rinovifuta.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/51328254937.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901110111.pdfIn PDF document text
    • http://minhanh.com/files/fapovesulanovifigepulu.pdfIn PDF document text
    • http://ailizia.com/userfiles/47860127378.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/widagitaludafofulus.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e858a2b9db7bd0fd88e0b4765fb1c88d/mebigitalivitesevepigeg.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/74547650755.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/25749247274.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/68701707168.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/91620885611.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/relejufozoxorijikorip.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vevuk.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/94193417337.pdfIn PDF document text
    • 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10120 bytes
SHA-256: ce11d3f4fea68ed891985eab2e4c6e79d94fd3a602e17b37103143fc4b8a38fa
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 19104 bytes
SHA-256: 3ac96d978242d4336e38b09272be9b0ddaeed449301896062fe1e7617a784d89