Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3527d2735c130b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 10:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 186ae7c3e585514a646cd860a1152481 SHA-1: 6281467ff71dabd42b245c9ccff11e0d65189a5c SHA-256: fc3527d2735c130bb337ac4c6d87757289ebe8dcad9e16975d8a62652b0b31f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. Although no scripts were directly extracted, the nature of the link farm suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a7a33811248046c78e0f34667b9d0b66/93749840251.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/46071163042.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/kizike.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/24f3a748e69cc0ee12069bde751a4ad0/gunobakow.pdfIn PDF document text
    • https://dhesient.com/media/kovala.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/33319613267.pdfIn PDF document text
    • http://darec.sk/files/files/2136258234.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/89929211580.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pi5qriod7goatlnpmi1mn7c9c2/jixudulalutemibabuxo.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/xodiva.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/19117943738.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/41588626593.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/23795559159.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d189981f---lofepenosinogimifogex.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/luduxupekoz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45c07fa2a---lonofa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4774bc73---bobejobipivoxamavida.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/lapivor.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/fojawominubanavexoxa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a391682ca46---vazarafafawawi.pdfIn PDF document text
    • http://asustainable.com/global/file/80322791695.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015f671a21---90850165620.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e806cec046---44788931506.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5ko831943r110huo937ohu3gam/4850935317.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/powexaginaroroxazebamu.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/42348228942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=types+of+angles+geometry+definition+pdfPDF 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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 19220 bytes
SHA-256: 3588828c09451e15cee577280cfda65b5bcf6531dcc23aa90c08cf109a8f4588
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 10920 bytes
SHA-256: 4239da99ab1f8342d4a3c71a8579e3d12be5d5870f3b6dc5c6b84fd5bd767b94
font_02_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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