Malicious PDF — malware analysis report

Static analysis result for SHA-256 c800ba7b69cf4944…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 04:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9f7828d54af0eb27e4c888886d2f109 SHA-1: 6e752aa11ff980566d1e4a4c525c56d03c8f9896 SHA-256: c800ba7b69cf4944ba181e6db83f38758f6ca864528da2f318af260c0536b863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs hosted on compromised websites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for JavaScript execution or further malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade393c4596---pogopuva.pdf In PDF document text
    • https://fasaac.org/temp//files/20859908894.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/34204228750.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/20fde73bda9308b338f71725d41115e3/92610084180.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/95553800578.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/44351802429.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/46963330935.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21b76e2ae---69171789484.pdfIn PDF document text
    • http://artepcb.com/upload/files/ziredejado.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/bt10ieeqfe4v4h9fqblfmpnmpd/zisuvosikiz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160743752cf5dd---pizoganofodamogudadaberen.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e4982a49b667274420354ef12ef1381d/14407028678.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/959f896176cf8ccce1cd439a0806babb/sapavalegimesij.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b282e830e---tixomebuxik.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/81788817410.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/bolevil.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad3247c6f---razinagugi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/guwurulesasudukujogo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ou3t6ond94h9vnp9fd8enl9ib7/30853612386.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096888ac97e4---17498705798.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/numep.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d2061eda546a888dc63c8a621f979edb/25743029337.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/20053617169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=easy+cartoon+character+costumesPDF 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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 17408 bytes
SHA-256: d8fb3b76f51e2b205b802163a4656577220f1e311930173c192e3833648781bc
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10552 bytes
SHA-256: fd419471c4e27752315fa059f5a003a071b7f0252bd66ec0fbffec9705cfd191

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