Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7e08e319ad2c1d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-20 11:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb1774e722c35aed0febd6728b8b5a9c SHA-1: 9d842f6cf1266d7c3f335892a3271f07a28c1cd6 SHA-256: bf7e08e319ad2c1dcc6cf10b99de699946796186737df2793298817b362298a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ae33efc9---53921102042.pdf In PDF document text
    • https://amblamy.ee/upload/file/wanaxofanajabekoka.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/46215725460.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/77975719262.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/bhmjn0a89v21cma2gnpkc1a4mu/lulesafavupetobotenakefid.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/gedofowopizodinof.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8a6afe34---95630115869.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b45bf5a37a3818aadc31f90600367be3/67804343833.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/49201982383.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f512300e743---65076045380.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qftks3fdanueujgck67ib0cqa3/vimapubarudoxupofawezos.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/31870327439.pdfIn PDF document text
    • http://scro.ru/pic/file/wotiwejagupemorejemane.pdfIn PDF document text
    • https://rajaunited.com/contents//files/lumebo.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/25814756913.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/lukesiv.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/26440781417.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b537dc55---18491365791.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/520b7d47c3a10c7b0c4d2a9b50b13bec/65377574698.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/69753869894.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/4573586286.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c1636ff1c50---65699102299.pdfIn PDF document text
    • http://ahchala.com/img/file/rigivax.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad22ca04---bevasasirawituzikefaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+much+does+it+cost+to+repair+a+mini+cooperPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10912 bytes
SHA-256: 292cfac5dfa7de435b3c787dce102636b0a71be39d3e9c4fd6deffb8c4dd4a8c
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 15960 bytes
SHA-256: 5c44dadb4dfcef24e850aca0dc23838cc5212401e7f68f684a653a6ac1916605