Malicious PDF — malware analysis report

Static analysis result for SHA-256 79afcdc2bf507bdc…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 01:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a61ffa159a94a4a22a6f024379594706 SHA-1: 6d29f677aac0476f349a8b51f0a7b5c1c19445c6 SHA-256: 79afcdc2bf507bdc97f8a2201848a73eb766a5649b6f502a957abea056812726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The structure suggests a link farm designed to obscure the final destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://laborke.ru/uplcv?utm_term=probability+math+worksheets PDF link annotation
    • http://www.horakgolf.cz/ckfinder/userfiles/files/2973776554.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106838d494a4---69027781585.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/fibabofizaviravudojidazo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/bulef.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/duzasuvarefalifa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qla4mkmvfch2e9230mppeejt0u/vawoz.pdfIn PDF document text
    • http://kccmaul.com/files/files/19870096295.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/suxutoketewa.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/rajoge.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jlmsjjhqve7ciu9n6lnot1kd1d/72344448914.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/mokedijow.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/ruzamezeduz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b5d66c7cb09545c4738e37cc135dbc8/24789747007.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/febigajoted.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jugetixomivifipogobenedib.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8834d6d736---43930705542.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vmcufqtt25uoq29eaec2omrocd/51012864941.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/98432343595.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130081693ef5---filenu.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/50457126001.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/10693733724.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/pubojisikudoga.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/rokakejadexusokalofu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15701499412.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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10700 bytes
SHA-256: 1fd516ffdbd118bdacb55de53f787cb7f9364846a037388eecf2d712eb73784d
font_02_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 18884 bytes
SHA-256: bc7fa644077baca09c9300a06f22f0272aa85849c47a4d99c73b644361380db2

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