Malicious PDF — malware analysis report

Static analysis result for SHA-256 9793cf7b6e662a14…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 20:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df6e76e0c81264c522e4b2429f68b283 SHA-1: 6b8c8e1d0b5cdfaf1334427da276179f7d3da18b SHA-256: 9793cf7b6e662a14fd51592d856950c0af0d1730c4fb251373d5d32069a94333
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous URLs, many of which are hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and a link farm on disposable hosting indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://levakov132.ru/userfiles/file/kefosofokonapudobikesu.pdf In PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/88092217695.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/19220375527.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/lekipemafozomugepelopapo.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/tabuluwagoti.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc074a9a15---sekovi.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/64743441369.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/58014091911.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gutabimopoxule.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/36695246258.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/22249016605.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sekopiwinoverezetaso.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614272dc8604a---dixekaponomiguzav.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/mivuwumufatu.pdfIn PDF document text
    • https://blogsma.com/files/67269408824.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109090051073424.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/60477425443.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/62036365625.pdfIn PDF document text
    • http://standardamulet.com/files/files/85210081314.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/kokili.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631916096.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fulunebolix.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/39826253297.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c6ea8af1---sovolurikumunulapaxena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gaming+mode+premium+apkPDF 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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 16220 bytes
SHA-256: 637b0950d2b8f6033b49e8dd32020545aaf24fbdfae2fe2eeba52f0e3e7b2a0a
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 10652 bytes
SHA-256: de476b2fe77ea22279e3bf85688bd412651e2ce70459999e562715b7b741ba19

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