Malicious PDF — malware analysis report

Static analysis result for SHA-256 60630482b73453c6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 17:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7eb7d382651b7cedb3625dc315103b58 SHA-1: d3341ec26c1e81983cc336b1854f3a1ee369f3d0 SHA-256: 60630482b73453c6ab0e67bd117be6b0bd1a6f8cbee0abce9b87f1e8c569e3d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://actybrain-consult.com/Upload/files/24337744016.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/xoxovedegukomibitub.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/94486457822.pdfIn PDF document text
    • https://sentralperdana.com/file/37841644722.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/fakasajededosasovo.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/dikonimuwugodaja.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad50ea0a0---30039916827.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/69292198228.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/69388139790.pdfIn PDF document text
    • http://theponghop.com/upload/files/nafafigelopepenaneguned.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443f077659a---34706993541.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/nonobamozokupiwuveb.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/95510994960.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/78233651281.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/60785161941.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613803c82c8e4---bukokugafifogisonefix.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/7731993019.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/41463348302.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/86543939457.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4f42f96109454fb69d1eb55989e6e829/56154521465.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/82307369123.pdfIn PDF document text
    • http://rhondachem.com/d/files/69066013454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=snapdragon+phones+under+30000+in+pakistanPDF 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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 11184 bytes
SHA-256: c6a8d71772f0c423c9170cb82f75f203dbd75422c132c1c58f0dd0eada826ce7
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 15060 bytes
SHA-256: 262a5d70c98909f2c5283c9b1cea0f5be350f84f57ad7768243eca24a29db496

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