Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53300acc5941753…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 05:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec704b9e2524a2f7b82c0fa535051ecb SHA-1: a71cf356ea426daa76ac6ce187ab076581f199a7 SHA-256: d53300acc59417531acc1a239e29679676d3b681f0171d0c0202d8044b58b289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely to distribute malware or phish for credentials. The document body is unreadable, but the heuristics strongly suggest a malicious intent through the use of numerous external links hosted on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kronospan-mofa-hungary.hu/editor_up/kamerakamigewiluf.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qo7c09g7rtah2pa15s86qfdvm/60007943259.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/podejivodukekojewibu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b7a9ed61---gupijesu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/64355900288.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/89763015215.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/genat.pdfIn PDF document text
    • https://vientangluc.com/upload/files/lixupota.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/92927312740.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115e083e70---sanovo.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/32170661059.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/xidakosunobimozasojo.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23530955546.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/57566211296.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/82377995892.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/majuxazadiri.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9tfvaaf9ajbjao3b6pq18mmun5/vegopof.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/medazikunosetademi.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100849209036.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300ebfe05b8---58141446047.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/xeladezulezavezitutetum.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/96697604735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+latitude+and+longitude+of+the+equatorPDF 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 10872 bytes
SHA-256: e9fd196f525418acfc0d3ecba1b2a844cbb7d78becebad8b4ee87e17a08e37e5
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 17544 bytes
SHA-256: 7bb99dcce096707ebf7a83e7a2c6d3a1ad705ba814fe217ff730f7e8d7e15f17
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1