Malicious PDF — malware analysis report

Static analysis result for SHA-256 916fc04a43aac999…

MALICIOUS

PDF

89.8 KB Created: 2021-08-15 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdbcbccd1a6e3556b643cca1d7a57116 SHA-1: c063c1a0066f0dbf4a4e3001f052be05fd0dd675 SHA-256: 916fc04a43aac99902dbc6c1daa7794447ff7fb4c9beca36febd9dc156ed5571
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or malware. The embedded JavaScript is likely responsible for executing the malicious action, such as downloading a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4r4utc9npanp0tl5t6b9kgrqol/28728110821.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec44a0af0---nipuvixinimizosisugotere.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/f1d68bbf65383de8482de937e0f99f1b/welaxemediruzawedu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703ebf2b75b---dekinepik.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/15873246835.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d036df0ea088c6547c87f5b54e39a08d/rokab.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/borupupid.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be697611e5b---roxojuvofofuponoli.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/sulemajusojin.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/70393410857.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xegojukamisumoruzudovali.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/24485482927.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/33490869443.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/mokulimeteladaw.pdfIn PDF document text
    • https://chptravel.ir/data/file/2722770265.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/48939854276.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607741bcd9423---xotexexeval.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cu268dmg6kmp58bjhh0oa2n9j1/bosaberavi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lgk3ov8sme4pmfdv9agf52se86/49811353054.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/81607179021.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/58747105094.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5811d6148---tuposadodunoxerivipuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hitchhiker%27s+guide+to+the+galaxy+radio+script+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/wudoxojobaxulila.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_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 17236 bytes
SHA-256: 52a611cf0a35ffaa9a83bdf233db273446546b3a1601fa823ffdd8c0008705c8
font_01_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 11228 bytes
SHA-256: 1ab0c48f9d4277c8647cb3e56d0016a7b878c7cd6b82c5d4138347710fed909e
font_02_sfnt_off00013e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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