Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc4f6174607e6b9…

MALICIOUS

PDF

82.4 KB Created: 2021-08-28 08:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82e670074b1f164c03a2b59bbe6f84cf SHA-1: e8334bec640877e382170f43bfeafefbbbfda5ee SHA-256: edc4f6174607e6b96e3cb18886cc2b3a28c168dfabafb8835af1a7b40907fece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://philabc.ru/uplcv?utm_term=how+to+hack+nintendo+switch+parental+controls PDF link annotation
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefomorikalugejaxirewu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/321f506b261c1a43d3b3a5840f55615c/30430795887.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/terukok.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a114b7e1d---36311229435.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/muwamawolufemodimaneteraf.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/vugitopugowipivumuwub.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15453989720.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6b4dac385---rikinujededitafanubemune.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/15036913949.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/xorijutevo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4jbdc7t0ktqjurs1ra8jfp2ehp/41544123819.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/35526282790.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/muwunimuwi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b2ce8485---61843467186.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608534f6ba877---80135859497.pdfIn PDF document text
    • http://hasyo.net/files/file/pukivobabegovutedaxetis.pdfIn PDF document text
    • http://praguetransfer.com/files/file/16033427748.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdef0911897---sexegavadavijezerikutisit.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/18225549686.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/65e4962e8d9d2fb9501956ba16313193/30408727144.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5630e1824a120563bae1527a4cdcde21/guvukexoma.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/be29237853f2e74ede6ede5d673efe35/79783738843.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/sozatizukuxebetuzob.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/jirojosiripekubidu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 17584 bytes
SHA-256: a86c75afa8826a4d671493f3b07cfe531ed7b9edde4fa7ae485d098485c11b63
font_01_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 17420 bytes
SHA-256: 530fd79c45d9abb3a3a20b249b56315613e07b9fdb6a09617c48478d7bd140b3
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 10780 bytes
SHA-256: 5fd111bfda0acbf9029afeefffef098efe4c24ab239eb4d20ad92a58ac864437

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