Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb39f0f7c035c46…

MALICIOUS

PDF

109.2 KB Created: 2021-08-07 02:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 993504bc39c76a19e8cffe9eb7150dba SHA-1: f0f9abfeb8c4054e58a19fa7a3bda4f6323ee886 SHA-256: 7eb39f0f7c035c46d72558ef1b58ab084f1b06c0ff87a84ccc2fde4783f2931d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs hosted on compromised CMS uploads and disposable domains, likely to trick users into downloading further malicious content. The presence of multiple PDF link farm heuristics reinforces 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://nirvanaegitimpaket.com/calisma2/files/uploads/nofelokopobop.pdf In PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/72059479302.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vamupujipitovatavijo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086904a11a6c---nujovumuso.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/fb4ef257608b68a84d1bd87373a51987/40682233427.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/daliwewek.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/71103037176.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/48281569057.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa60ced5b0---xoxaxetowuganeriredelanit.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/5344592713.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071270bd2820---morobiwef.pdfIn PDF document text
    • http://szwygs.com/upload/wirozepujavajevijerelogoj.pdfIn PDF document text
    • http://henca.com/files/details/file/najaw.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/bedegozuvusori.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7u8a8gpg8lkett1lhqprubi5m7/gisidoza.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/doboxikofelutojef.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ed95817dc7b---mubikadijufatelujezevut.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c58714a4665---wizogegogifuxomibus.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3cb41b81---liwovukirok.pdfIn PDF document text
    • http://kbchina.de/upload/11458379008.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/cc397fb8ff90b31bd9075c12b16b4633/womoxejopunenotojivini.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/ritaxozune.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/de326bc4e7693d064bdc6561445e3a86/rufanak.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607165edbcc8a---16118797671.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609522dcdb291---tanoxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=trials+of+apollo+4+pdf+free+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_off0001480c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16023 10520 bytes
SHA-256: 824b14d8ff94ec631d298f00be564b9b69be5d1f97f2fb6c00719fd89db2a61d
font_02_sfnt_off00017842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17842 17844 bytes
SHA-256: f17a81075952dadbaa12892e35be5584ea250599502960e1ef3be2ad923f96f8

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