Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca0f702003b7132…

MALICIOUS

PDF

96.3 KB Created: 2021-09-20 17:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66b987ffe930572bfc927f9c19b47e16 SHA-1: a03815817a0d03a0a34c8ef5144cc92b2097a66c SHA-256: 0ca0f702003b7132d66d0cab68ea1bb41e5b1e0ef77d14437502837b73c3d0c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains. The heuristics indicate a link farm designed to redirect users, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=operations+management+and+tqm+pdf PDF link annotation
    • http://webinaris.net/ckfinder/userfiles/publics/files/gedubom.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/384092b26b8a905e6d818f2daca32bd9/7743256030.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9b586bb4bc72bbfb88098a48f0640583/benisetobeveko.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16146edb3113f2---jonugetodepedodeji.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jevadazu.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/51337149105.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/22855879012.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/44860972799.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210903_042033.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/49592316636.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ferejunenafozibovajinajo.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/64829372042.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2b422466---90287241141.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/52650325363.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/47194568901.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/42171439275.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/bonuvabuwugujo.pdfIn PDF document text
    • https://keongracun.org/contents/files/7505966120.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/zuditu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e318cc403---luwenawesifimu.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/76612598807.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/99968969711.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/puneruwu.pdfIn PDF document text
    • http://abnicum.ru/files/file/48340785866.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/79685042391.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/28779659487.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_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10964 bytes
SHA-256: 96bba55d76c6413d362938cb87ee762232305e9382a198f079d27b5efa7da666
font_01_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 17524 bytes
SHA-256: 7ac583b298d4caa63bd9ed4913990a34594de044682bc54b9722f5531429f1e5
font_02_sfnt_off00015b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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