Malicious PDF — malware analysis report

Static analysis result for SHA-256 3320ac4e420aa64d…

MALICIOUS

PDF

84.5 KB Created: 2021-08-06 18:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cff4ae2f383728184881f9e7e77df628 SHA-1: 6ef05d4bb9a9adb001fc247ed62135341294e215 SHA-256: 3320ac4e420aa64d47be5f3c2aae317efda89032a478741006d5d318ed85bb2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms on potentially malicious infrastructure. The embedded JavaScript likely serves to redirect users to these malicious sites, facilitating phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://affordableadobe.com/ckfinder/userfiles/files/wiposube.pdf In PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210614054221591483lr5gvg.pdfIn PDF document text
    • http://www.moyekolodin.com/files/85046328701.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/204584271.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/xulukanilowuxo.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/33872548970.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/duwopakuro.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/26531648904.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ho4g13qhrv2cubns954gabni63/sedan.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/lolopuligaxapike.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/77835626601.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bc93169c06726b52cf5763601a8d53c7/33421098882.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/90bec2a34e79cde50e8bee04b42d3bd8/85920175020.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1e0cfa80---mepedefazunif.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7e40ccd2---84128429266.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/350a303891b7c8da5054ae5bfd8d6697/letebololuwogumonem.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/10579bb18e85960cfcd705ccde45e8bf/54546692993.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zegobulubifegojuzifebite.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/golovitudanepotowenagelav.pdfIn PDF document text
    • http://stevis.cz/files/file/95294686425.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/jadazerumuwonuxikozimiw.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c298c047ea---19736474642.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2qgajtm6187h1ttoheh7pgtvk/35157932393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=identifying+types+of+chemical+reactions+worksheet+answer+keyPDF 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 11312 bytes
SHA-256: c11624362dc293418fdfe703019979e32f4cf82b7a16a8b301af2ae86b4a688a
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 17460 bytes
SHA-256: 98ffa540e551a36349a1ae214d07ae883a87e33ef8712ee205f8aa9a6ed57820

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