Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7efca1bd64b46d3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4017b5e4238d874f8d001d959b728c09 SHA-1: d1281071fefcaac98d79ccfedd3b84c22a70be8a SHA-256: c7efca1bd64b46d32ce08e7059404fadd6f2f44afc42ddd6ad29663d3d1178d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://centralgiving.com/media/userfiles/file/88899853828.pdf In PDF document text
    • http://tranhdaquydep.vn/upload/files/sisajizekirefumiki.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/pefuruko.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/14362272233.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/39243446947.pdfIn PDF document text
    • http://rcot.by/pics/files/17927106770.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110eef7b968f---lojiboxebiburasuluwixik.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74c42781c---45460280568.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afafe4c95c6---90629063068.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/88146069083.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/donegirivukized.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/76941266752.pdfIn PDF document text
    • http://scsytech.com/upload/files/japulo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161157e484aeff---gozevaporuxanubigumek.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0273844001620026527.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/29d2f9b17c0f4f3f5a4f136e1cc060a6/66514390413.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f8092fb5---27461970625.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/6801860337.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/50829940318.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/buvadoginimizedubiroz.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c338k1g65v5ae7es01vnfdjoo/sakalenadalomafux.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/10479835019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=parasuraman+service+quality+questionnaire+pdfPDF 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_off0000c121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 11208 bytes
SHA-256: acfe4d1065cf1ee451cbae2e065234ef1ba3b13a34d814d0436843261e33d6e0
font_01_sfnt_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 17208 bytes
SHA-256: 1df8c03c2301ce846e67d8b85d0371586c9a9646876571ea25fa4ce6fa675a78
font_02_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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