Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4364e91cf695f2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6fdfcbba3de06bd79c3a2516fb3a4c7 SHA-1: 8c226374fca8107f4fc0bea9a5268b9218fdcd1a SHA-256: 7d4364e91cf695f2232a98bfbd2efab0f5740b72ddd0d9e9f79067ec889b0843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload sites, likely to host phishing pages or further malware. The presence of embedded URLs and the nature of the heuristics suggest it is part of a phishing campaign, possibly using a fake application form lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b1fc1cf5---dawosezowuwumitumilidutu.pdf In PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmoco9svfgr789oofk4tnb11c4/73724639283.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e99b288ef---kawalav.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2f67ccf0---retapokojuvibibigidowu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3670d5c240a35b2b0b57cb096cf1695e/66266790430.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab5ad25bf3---wipaxosovafelikusokak.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7651f4e1d6---22276295014.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/68060180199.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/xetex.pdfIn PDF document text
    • https://dm288.rs/slicice/file/16541783288.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3932be1ae---21859945682.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7599913e2---90346180676.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5212626c---gotefazavabowep.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zigudozovukeraber.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xolixirixedep.pdfIn PDF document text
    • http://waterreducer.cn/d/files/53233416690.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1d6e8ac90c7fa962e92b808a99621ad2/16668890509.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/5116671465.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sjmeuhauetb5bi0omdg50vqtrf/76475450893.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/25986929453.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121298be1613---19977769941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pmay+application+form+pdf+sbiPDF 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_off0000bf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10904 bytes
SHA-256: 707041217aac968820e44880063d305c3c295296263cf54d035b6d8c090f2bdb
font_02_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 20108 bytes
SHA-256: 0d4f4703744eb6b2f6ce43f0c992e321968317b811f053dc9e271b0565819647

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