Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fff36717220647…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 12:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20b99543b39c4c776da05f5e8755a29d SHA-1: 7e711e0eee33c14d4f662413b84f9c54478bec5e SHA-256: c2fff367172206478d25fe8178e2aaf6355b87c5a0e56ecf9603e5b6c853357f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4de8205b0---bupumanolipiz.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160727b0c2ba76---bexujorowomapirelemoden.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/36593802912.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/zovowopugoduwumeposuneg.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e26a90d1c---dagonewumagi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d18cb6691---40992451210.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/badasetuwijes.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/tolimis.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f92e67c13b0---98079757102.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/75077566713.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/22975041545.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/48876414617.pdfIn PDF document text
    • http://mosjob.ru/images/file/40620448927.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qm9ack72bcf5474ugs82fskf2e/12656527997.pdfIn PDF document text
    • http://poorclarescork.ie/images/54881169273.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/nosimul.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b594b224666d2dc8c6272331a251ea5/wovelini.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59505730166.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120203be313d---43128050082.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/97051959007.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160920634b88ce---kobatoli.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/75020141473.pdfIn PDF document text
    • http://betamarin.com/images/media/files/90794396153.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/22003122770.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cabab9858ea---23376722862.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161242afe24f3f---raduri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=autocad+drawing+to+pdf+converter+software+free+downloadPDF 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_off0000bd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4C 16160 bytes
SHA-256: 0ded3efa54e6299af23f2c6aea545b3d9135b85ac1a83dbe35acb10b7c1e1a3c
font_01_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 11028 bytes
SHA-256: cedb334f972d4fe7c6716071c40e9d596f9d4f9550e91828b25e8cc686decc7d
font_02_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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