Malicious PDF — malware analysis report

Static analysis result for SHA-256 e875134799abec3a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 01:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0f3eebd0a0114a32acc9e71463e5dec SHA-1: 6db2ef2b4471e590ac90141bbcbf68ebf45b138e SHA-256: e875134799abec3a6439fa7d3a64ef4d84cba17637445eb331aaad5cd19a645d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the URL patterns and heuristic firings point to a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drafthe.ru/uplcv?utm_term=activate+office+2019+key PDF link annotation
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lamowekowebemifowajeb.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/segaxajiwexopupobof.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bevawunujexamobabaju.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/70837425630.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vaguwa.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/57958445166.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/mimagorokeluveramimomepit.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/46990252285.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144307950361---zekujaw.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/kuzifibolokitowurujazat.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/73808364056.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/kewuluxarilulemile.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138e55e299d2---74259879635.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/rimixu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e665fa8d5c---xekukabisizowo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/poxojalekavaralupu.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/81922737694.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/58141563420.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ximofujivejeledug.pdfIn PDF document text
    • http://telecycling.info/files/file/15442803429.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/wubamediruxabilufezot.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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10624 bytes
SHA-256: bbdb2fb0bc224a75049f97224f7c3461964061315e8475bbbf33dfa7417aab7d
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 18388 bytes
SHA-256: cce3f33a124946bb7b6093444afeaab3eb56837f533dbb3f3b38deadcdb4186f