Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b749723d35e79f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 13:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65e5483a3efb8f35b2b01c6f7e296327 SHA-1: 88882e3028589ea32a66e702b32d57ac6c8f3c36 SHA-256: 67b749723d35e79f6ba30ffaafd44a4fc58f855eea4ffdc81558a80f721c5690
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vekosgroup.ru/userfiles/file/26457660083.pdf In PDF document text
    • https://tenhucchi.com/upload/files/3306055722.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84325404019.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/jakizaxes.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140456e969b1---39221942666.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/63378472958.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xokakulusaxum.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec12e46168---zivapesenaj.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/tamofakopujusonobote.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rikalosebixebirotenonis.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/sirivorukidanokeritep.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/matakoxifefiwulo.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/71362791160.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/ralazizomizavuvixosaj.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wibajizixexonogevadesito.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/xutibewisinixaranek.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/sudojanel.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632077717_3dfdef48c7.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/70544316070.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/93495479657.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/bufutavaw.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0748b6324---53558771793.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lotuboxobabutekib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=empire+war+mod+apkPDF 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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 16704 bytes
SHA-256: cf354ce79d0016f033cbe410ec49a207047d65f3756225d0c36282296bd330c5
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10296 bytes
SHA-256: bad862e9f74c7dc346dfd1d3a8f022c07059d9c715babb1d39f7d6d9264e8d66

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