Malicious PDF — malware analysis report

Static analysis result for SHA-256 c477f7c2df48cefd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 09:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00e3dbcd941e9e3955dc0a3aeb4f80b3 SHA-1: cf51ccbb0091e9064391838625543f913c74e0e6 SHA-256: c477f7c2df48cefd4792cac79d6056957982d46a2a514fd8b02ef56bb6f31489
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF is part of a link farm hosted on compromised websites, likely serving as a lure for phishing or malware delivery. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest the document's content is designed to trick users into downloading further malicious content, potentially via JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=attestation+de+loyer+caf+pdf+remplissable PDF link annotation
    • http://padgettlawreunion.com/clients/79772/File/72663970377.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/kuvufesadexaxo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fs515mrv0jg5bq91nv0ui0dr37/63289069625.pdfIn PDF document text
    • https://btegypt.com/file/fikuvebejawukatesejewi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nufiximusitezawijar.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f384cc4---puwakozipel.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/wozeru.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/30885693864.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/17334626463.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b43348dae0---zufuxug.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/49216796896.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea6b2696c---24893153229.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lozogusozinojefexokelaf.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lukad.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c75be3bba2---zabusanatofajegedugojojes.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad854a39c140362b2a3f58944f80cd7c/mugobemosolejetokot.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a6d8bbb4---rakesunanupibupipitizos.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/mezisabaxelotiwewuxoniv.pdfIn PDF document text
    • https://uangraja.com/contents/files/nojidet.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/zokiwujubi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d73a04360845980cfe9c220af988c7d9/zasino.pdfIn PDF document text
    • http://web68s.com/upload/files/55986981722.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/e9ofm231tlpfh7mdbi0lioisb2/45698565606.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6cfadf78f839c8a0af3c4f5a7a774d55/30232894435.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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 11016 bytes
SHA-256: 08a8fcfe6a422efdb623678b342ec03aa075590752a4985d51157a50af183707
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 18192 bytes
SHA-256: 3fc11cfb050dc63586d6ab9892271297a51be2492262c2cbf27379b23b9dbd6f
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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