Malicious PDF — malware analysis report

Static analysis result for SHA-256 863c3cbb593b7451…

MALICIOUS

PDF

88.8 KB Created: 2021-07-22 19:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73fefe4730dfd7f39ba73f1f46b9ff63 SHA-1: 1b2a7d81d2d42542e7d9c86492ddd37e889b55fc SHA-256: 863c3cbb593b7451e32ca186e51b02f7ade3014ceef538d268d9fa8d5ecdff95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skybuildinfraprojects.com/uploads/40158308075.pdf In PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/2fc926974994d7f512d736e26c237457/pisilinukali.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c692f2f50---duzopeviguvoxilazokezova.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/xebivukekilewogixexalavu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83138b0aef---78323996054.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7d1f821068832f24c8a2a12d97f41aa1/50672293244.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f529bc63ca---betojozexinigi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97372171952.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7c473dd3b0cdb646d5f317dc3ac9f302/vofiwivefesumez.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db700a0485---62472294800.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d791e267---72091067537.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/45645934830.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/29306114631.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5fd53176---59898689026.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/18d17db89543146577f3f2fb5936a3f4/31632396745.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jiwisigikodatoruj.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/71887490580.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/favovor.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/dozuj.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/tifudebeminaw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca67f541d492d0e2a9031de092504393/48303541863.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vojaguritiv.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/322f8cee701cc7d0b210b084b5c43134/defurezejedimaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=moroccan+chicken+and+lentilsPDF 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_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 19060 bytes
SHA-256: 1181794d6054996c2139037906469c70eeca2ba49c1bc032f3e33b75e514ec2b
font_01_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 10552 bytes
SHA-256: 8e3f9acd8171b32885a66ffe70a5493b2e063fff5452986287154bda53fc842f
font_02_sfnt_off00013d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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