Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c657436bec1f4c9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 02:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1cccd845d4daf133248a9fbc9e2fd47 SHA-1: f41c0177b2cf2ec0c9276552288595c88ebd3a0f SHA-256: 2c657436bec1f4c9f739f0a5e9461907aa3a02e0cb0c52de0262a2bf3d235821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging T1059.007 if any JavaScript is present within the PDF's active content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=she+were+or+she+was PDF link annotation
    • https://daaeportrett.no/upload/file/6820331065.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/bevovunaluzilulerufen.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/ludutukamavefoviruro.pdfIn PDF document text
    • http://biosite.ru/images/news/file/zedonu.pdfIn PDF document text
    • http://bakoca.hu/files/file/zugebedo.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/segotovisunazati.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/bejedujelukabikivotirokoj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59a52adbceae134b71ae3d827b768b37/79837970092.pdfIn PDF document text
    • http://ledins.lv/cms/file/26961393512.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0b400b177105f76373cf99f3fca84317/34835548526.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/87656935035.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606feda782dac---59083205672.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/35911996795.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb68ea788---wekuxapiderunisujujas.pdfIn PDF document text
    • http://lucann.com/Upload/file/23006583835.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5682ddb2fa11b258c2120412d0272e3b/lafusoxuxuketonapuvi.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wetujopapilimanozubomu.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/80975253111.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210624_386DB8995DAB3BB1.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wawerajevupe.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/79804902410.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/62684697191.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/notisuwuwufusipori.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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 10028 bytes
SHA-256: ea7cb8bdc97339b6946ca3a9548a84b30ef08df0f90c9af991c862cd0a47cb52
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 18188 bytes
SHA-256: de857502847f2724d360d37ae50848949bda4ff68d5bf1fde6811729ab632d93

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