Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff80be82df88555…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 16:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbf0e514f9dab230e214a9cb7ecf4de7 SHA-1: 07c878347aed8b5816224d0a9fd23e60403f7692 SHA-256: dff80be82df8855595891ecf5b19e60ee374a8c488f1ef79deb264f21b2ab5a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the ultimate destination of the user. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn--80aesyq.xn--p1acf/files/file/pugixitowokakoxumobex.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/4197350581.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/89591833415.pdfIn PDF document text
    • http://btfa.tw/upload/files/91776749894.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wulosurik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b977788127---16044205611.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/60504525873.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/397173251.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/pototomezugof.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc584c608---87125363315.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/94091554084.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/86847232146.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/59596845438.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/kitinizowolivif.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/kasuxof.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614839137235d---50657934791.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/98077297332.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/t4rluiurbrp9q756p7gcgbu816/72354641431.pdfIn PDF document text
    • http://soles2walk.com/data/file/59533395269.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142798d4d092---8493486815.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aadadd1625---durokejubamogunako.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/37287823394.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/16186698287.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/83225116138.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/jozepof.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef10b5ef96---3493665658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gabbar+is+back+full+movie+hd+720pPDF 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_off0000b565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 18888 bytes
SHA-256: e53820fe3845424beebd64f30d3a30cc6872b494cd4ad85726a41efacb3043d3
font_02_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 11412 bytes
SHA-256: a7edceb31c02343e1a52d59b2855ca9f572a4eec3c552a3d24e1a5d8d1139bb8

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