Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a4de9dd0770d5f…

MALICIOUS

PDF

89.4 KB Created: 2021-07-15 14:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8c09654e80b3cfbdb749f5fd2b4b7490 SHA-1: b47899b3ae6269d01bb9af62a8e1bff751c7f316 SHA-256: 67a4de9dd0770d5fef7cb6bc5e430679a5dd52b8538c6a854be1a7a5bef19f72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://evpltravel.com/xv_image/file/77110560607.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/85f610e2f58c5360a0c7cd535b86aa07/vamobagupabinewurizi.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/62444257328.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7nb0du4kftlindk67ohe16h8ms/94321264219.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210524015952351724yrmhom.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9adfbefe2835c2ad754742c160ae07d9/manegumubefos.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e98783fd---kesakuwulovemepesepu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5746733a7eb273a53182b4797a7f0492/37724533857.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e009f482---86822199747.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/pomawumagozuxe.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c057f3cc453---fukevomag.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/dowapud.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/92144521536.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c629d5de9ad---77040038335.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5a8063f4---sodoxewiximowufowob.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8289d30fc93278eece8f90d6e6c823ac/wogixozopelonunupuki.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/kedadivufax.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/dinaliwi.pdfIn PDF document text
    • http://vo23.ru/upload/file/80301576503.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/48760984905.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d276093e20---xikafugudegumulire.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/97865860543.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/53394845197.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xanurodumubizuzudozura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cost+of+indian+matchmakerPDF 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_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 17188 bytes
SHA-256: 1b25282f2a6c8a7153e190d394639745fbee4d4ef84208940b95c275f410c727
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10816 bytes
SHA-256: f6f92740341e9641d8d32f249b6ba4fb312050a01817006f20f7f58da864d175
font_02_sfnt_off00013ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1