Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a50acc3e1ed798…

MALICIOUS

PDF

95.9 KB Created: 2021-08-09 02:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc03761d018f669f8f5f73b2c5636963 SHA-1: b1591125c0e5c3af459a80fc14f6fc97b99bdcbd SHA-256: f0a50acc3e1ed7983cd9ae2aab3741e8e060edb694a3afae398f15fc24ad0517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the link farm nature and heuristic firings are sufficient to assess its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b341453d1---vuvasez.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c97c3a78b---82562484670.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/20141779816.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nesifojelutonov.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/12830085497.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lebadojanonuro.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77944569113.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/394e59hl68lvuh32p6p8rsahtj/99004447770.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/numazisukubafixokexojukug.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c43e9e4e5bff7ac67d08ff2cd9dd04b1/43403710533.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/80749795818.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161071b4a6d755---60955499192.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b730d7ce34d---vidosorumujojefotu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd617e8aebe---suvuvetexabagofuzok.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160717ebfae6a2---vujuwodalenamimutemim.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161049e4879ef0---dadabixamajowajutaw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb829101c2---foxejawodidar.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427684bdde---lesoxawigizogulegifizubu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1b401ad5---78608152926.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/17287684977.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7e51de35be775982d3948a2e2d4c7415/tuzomebapi.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/38516508840.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/14739007391.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/27409180468.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a229a71e973---jefolu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b3100c98f---danakesifojerenene.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/55004493947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+etica+adolfo+sanchez+vazquez+pdfPDF 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_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 11188 bytes
SHA-256: 24d90810c615d9ed79917b63f9a3f8c0543e83cb2e8312bed38dbedbf6f3b0e2
font_01_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F3 17924 bytes
SHA-256: 2a5f0fca4c1d3f51633aabe5497213ca1819f8ca4544a286fd35ea02f67b6aa8

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