Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdc4cd191b33a66…

MALICIOUS

PDF

77.9 KB Created: 2021-10-03 14:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0fce840ca1042f0e1eac3af784b368a SHA-1: 23d443418e553eede7715bb1c2054c11763f1bb8 SHA-256: 1bdc4cd191b33a66aee34ed97c0bab2a169cd8db97871fe5a7943698cfdfe215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://drafthe.ru/uplcv?utm_term=difference+between+fan+and+blower+pdf PDF link annotation
    • http://talk200.com/admin/admin/uploadfiles/file/fopexo.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/sikezukubamaletuxareji.pdfIn PDF document text
    • http://baove24h.info/upload/files/kogapifomo.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/13570574238.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/84586176670.pdfIn PDF document text
    • http://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/zezadowipige.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/388c361f6b08a8eed5a4e0f1562beaf8/53483571197.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/xululisipuxitekegof.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/79967486136.pdfIn PDF document text
    • http://viorina-deko.com/images/file/73636273866.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c6dd8b81375fa21b0fcaff1769281605/baporeg.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150de4c50cce---62686045409.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/62731809088.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158ef2093ba3---82196413449.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/wexepu.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nakasenilifukesumelaf.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/70551610855.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/rubedokapesojetobikizuxi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158515331590---seberinowa.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/gaxasetuxe.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021100217530395.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/72286185025.pdfIn PDF document text
    • 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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 10672 bytes
SHA-256: 3ede413e940f2535b451b1f4281fb0d12c416bcf5fda048c79e1f50afcdce64d
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 19312 bytes
SHA-256: f398bd0a37cb8a58215af421d39c94aa11b7753f0d7c2156c4215309ded306ed
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.