Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f73c4ec93b90739…

MALICIOUS

PDF

82.8 KB Created: 2021-08-30 19:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77c71cb326a2483be7be93baf452b77b SHA-1: 524dc5a848adbc6b6e2102bd0a339a0409d31afa SHA-256: 3f73c4ec93b9073945bbc7b6ea1946c77836e817ee515dbb81d57a7454549cb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_INVOICE_LURE' further supports a phishing or scamming motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://snqrsl.quebec/upload/editor/file/kirudobebarefo.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6eiicbpk8n64qtq37od2cp49d7/81797106570.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/tomepid.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/jowikewasabalukezenimu.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bipizanegaruwavuvevop.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1c3d4cb8---76889135883.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/tapuzukakapuma.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/63840115062.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a05ok3a1dssbdsrvbf2f7rier4/87172208660.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/38736852822.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6eomo9dshqp5fhe2pqm32afhm4/96617131483.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95167668982.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nijonadinibeberesoxanum.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769203185aa---49617802926.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/17769928525.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/53755731693.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021060907212877.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/232285c4df3ecfc9bbd5b381c88fc65c/fenipalabalunat.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hq5qti8kro4fjkhq1gvp9fu520/mizikofixe.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/80143236164.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c8735cad---62800024243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apply+for+ts+eamcet+counsellingPDF 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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 17508 bytes
SHA-256: 5827feee1bdd04110d31200fd7a8f63395815db5bc7a516eb6ded0bfbc79c8bb
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 11016 bytes
SHA-256: 89e398b49b72116dc5956ffddc88d5c21efd1250f09b4cf21fa2d9260a5e2e50
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1