Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e578879788dea0b…

MALICIOUS

PDF

106.9 KB Created: 2021-07-02 01:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efa1f0adb4fb962863f0ea0256173c08 SHA-1: 68fb2f477ea0b5e54b769b9503ebe20e4a50549a SHA-256: 9e578879788dea0b8c2feba1e9239f13332479527cd0cfdd025daae3c34cd7b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to one of the numerous linked domains, which are part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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 https://philabc.ru/uplcv?utm_term=postharvest+management+of+fruits+and+vegetables
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1hr5kaav64an3vcc6shhihn1m1/26001364246.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809d6f6a743---wokizo.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b03d7c0a---jokibewad.pdf
    • http://nickels.design/ckfinder/userfiles/files/notelulevupobena.pdf
    • http://travelshops.pl/userfiles/file/77072326259.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/buwuziwiradupudebera.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2himo83ikctoaiqghu5pi05jf6/fanumisivagutip.pdf
    • http://blow-w124.com/js/upload/files/salipujimugi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49b41b487---36674095322.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade9ac9e7f9---simenozoniva.pdf
    • http://lifecare4all.com/upload/files/kugemewiniva.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8b4e983f4dffbd7eea309b97cfdd12b4/50725912266.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f8c5b50a---35304113723.pdf
    • http://tantos.jp/js/upload/files/nikubidopotixasagaworika.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ca8c83a7---kogobikan.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb9fa8de9d---koxarulabevesi.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/85747706359.pdf
    • http://adamlegal.com/userfiles/file/ruribuxifotup.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08f950eab---jisixupupidozufom.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a35b79960---figoti.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c985baf0---62787379083.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160918850c9899---gaxibediv.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/74adafe197f24d4d0e1fcc0769ea60f1/69830654796.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hnqro5cf8pj2fe4o3h3gifaiuu/68467593372.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/76312436288.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/4580694348.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012611.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 16232 bytes
font_01_sfnt_off00013be6.bin
fb33347577f9fa345ec9affbc211ae73b7ae4d55d6133d0e151b4909710125ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE6 18628 bytes
font_02_sfnt_off00016b55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B55 16792 bytes
font_03_sfnt_off0001836c.bin
b2749ce5c80575fe5ca68eea27b9b18f663cd570621c12976b1961d1a3308915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1836C 11108 bytes

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