Malicious PDF — malware analysis report

Static analysis result for SHA-256 b591f7bbdee4e0ef…

MALICIOUS

PDF

79.9 KB Created: 2021-06-15 11:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 07150e676bd3b2f96d80282d04c80dd2 SHA-1: 0176623cdeb41a1654040463641f1ff314387170 SHA-256: b591f7bbdee4e0ef9f367e1a2f83846a9d9a37f7b986668b6a1d8d0fb3c5519a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, includes a search query related to Chromecast, which is likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=how+to+connect+my+tv+to+chromecast PDF link annotation
    • http://hani-bee.com/userfiles/files/dafomepozagujoze.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/9374538089.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c43dbc51---48398559963.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1t3l6us78aq72j90hr466hi212/49836770500.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/58986238198.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c252f134bca45620dd9f1ca6036a5cb4/nexazitopolumetevenofefe.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/4676320273.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/niwadukovidokegup.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081440b881cf---86064543574.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zitexokovugiputo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/67667353742.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/67845825812.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/10007645235.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075e87e9a3f6---2943300153.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/dibedenumuxotivuwasuguxu.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/16179167230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 5220 bytes
SHA-256: 99764510d4c53a7627daa70a30fac222d378aa465b0105764d42caf022581aad
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 12188 bytes
SHA-256: 182a6b0f2f27b5bc47c2b3402e6131c316739db91d32555192a85b93e819c9cb

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