Malicious PDF — malware analysis report

Static analysis result for SHA-256 b053eb24e0d8af6f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 10:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77e77500107dbd09afe2c3cc0082745f SHA-1: 32ade882c5ac42562bff45a630d40559cc11549a SHA-256: b053eb24e0d8af6f1e61db98ebc35c1d23acd8c31eee3d441731a747f45df1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a second-stage payload. The presence of embedded URLs and the nature of the heuristic firings point towards a phishing attack leveraging a compromised document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://krisoc.ru/uplcv?utm_term=banking+interview+questions+pdf+download PDF link annotation
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d95698d54598e803698f48be40cb80db/sugobowalera.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/jetijubobapelujidavuvot.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610568322b0e2---mezutabakofikuvebojip.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da754bad785---95784990714.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/55667398757.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/813ffabdfcae2a2c0009688b4bb63cc6/3264179686.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/rulesatipetakut.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/50139637465.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/semulipuresudozut.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/33729273174.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/61248269710.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/83b9b963a61656f60cbde96c9e6ccb16/depukitomapiradib.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/50p66luojf2ilh3756rbhkopcv/jodekawane.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6p467r8l8gk8bbjvpe4hulsms3/24504371349.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2968404ff---70567106154.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lfdf6ar30i13lp0a3si1q8kanq/71612077945.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/80189851365.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/aa2ef6350fdf98b33c3b1a76d9937a22/muzakofedanodi.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/53341107915.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/51870245738.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/26206861803.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_off0000b60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 15396 bytes
SHA-256: aa2360e583c13c8bb374a24f0404432339b11e3f4e02719fecf8522951371a3c
font_02_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 11216 bytes
SHA-256: 425b067a7abb13c9fc2759ba1effe5c684d08c904e283a3f71f9fa8d8797e0d1

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