Malicious PDF — malware analysis report

Static analysis result for SHA-256 4597bdc4b048640c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 11:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78b530c723fe79091e264f33ff19c832 SHA-1: 5019aff0abd9b8e6ea221804ec9bbc2a6af0ab79 SHA-256: 4597bdc4b048640cec69c0be343a8362766c00182e2069a788a49393c301aa48
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://ikra-ekb.ru/files/fckeditor/file/45670841035.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/79653110016.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/fajiduzub.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/wawoz.pdfIn PDF document text
    • http://www.siposferenc.hu/html/fupevorumale.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe579dc08---84995089720.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/99104872370.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b787735eb6---19650814719.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609842e067a27---18189190081.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/78892537965.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/49c8ea0f8e59ce347ef41b5091a1ee3a/zegebudi.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/vobosifuxi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca4d9678a6---34450006901.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/30430403437.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc49f07aa3---94130999.pdfIn PDF document text
    • http://flexa.cz/docs/file/nozebagudamapusepabibe.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/luxuvezaw.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4io4puj5ve0797ljo1tq99014i/gusazupeseduxu.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/ranasowawozexisanojowame.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3f2e949cd67ba59b1d2dfc398c43d67b/gekawomevava.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/39019550121.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/ludemotigozabowulop.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/lujuxafurufe.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/mozobati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=platinum+business+studies+grade+11+caps+textbook+pdf+downloadPDF 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_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 17180 bytes
SHA-256: 3d595fe976cb17b6c4fffad036f9d8e898d94d26555e7ae97d18d066fdd660fa
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 11536 bytes
SHA-256: 130c7d89f26d0aa001a402c8d798ac0f0e48ef2ce30f729cc26d7059ce9752e2
font_02_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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