Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c0d85f72d29a89…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 06:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6749414f7eb50a34dd63592369707f0 SHA-1: 4284503aca2946d08a3ee7c14cc833e767089713 SHA-256: c3c0d85f72d29a893b53c404f4321aa04c638b21433d4e6330e2577bf1602454
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its role in a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of suspicious URLs suggest the primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=the+lean+startup+free+pdf PDF link annotation
    • http://business-baltic.com/myfiles/dok/tetisofadoka.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3ac6016d---nirixisenuvaxesejosuvab.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/gadivusorupifemiw.pdfIn PDF document text
    • http://kite-surf.sk/files/87436889636.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613494f35023b---60832120026.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/99684122127.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/tenute.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/46556009493.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96176359917.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109071331576965.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ae53d1ac---rakuxorotebavazimema.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/44236439346.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/58866926943.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139206b1f4d9---32305370971.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/48471901063.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/17291463584.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/98132440413.pdfIn PDF document text
    • https://vestol.bg/files/file/14152395623.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/gizeromo.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/29615013250.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/xixewov.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b4a48df8---46741542887.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zexuzidu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/3270145523.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/watuvan.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_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 18352 bytes
SHA-256: d5fed6149df12fe590e9c150acaa57fc22f69ab4db751aa611eef8629164d525
font_01_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 10444 bytes
SHA-256: 02c9bf2138f086473539742d1cc4cb70a0715047a9e422ebdde85312fe7f5d87
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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