Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f3a65bf4edc6a2…

MALICIOUS

PDF

109.2 KB Created: 2021-09-07 03:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e4c4c60cf812c8d2ddf6cc25c6722fd SHA-1: 7b33e9e7b3f293b752af91c39c986939f8ca82c6 SHA-256: 54f3a65bf4edc6a2944f272c3cb5eacb7de532f3986e6bec2077bf1cd67a15b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript stream further supports malicious activity, likely used to redirect users to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=polymerization+process+modeling+dotson+download+pdf PDF link annotation
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/zawaleponerixuvenek.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/luzajajaxug.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/muwexaledozizadima.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/vutipopivu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49487806192.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/xeroxamobijix.pdfIn PDF document text
    • http://kco.su/userfiles/file/67173601440.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16093012f535e6---3711096920.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o08tpp8i2o9et8hs986gkpcps9/wufebexolisabe.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/nedodif.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021060516102867.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/dufazuzijufeto.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0s11hn3m97t7gb908f022ook9f/92895544429.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609037f57635c---40971954719.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zutiripubasevipe.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6f6da045e---bojegupuromab.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7f140aec88b737783e9e954303e17749/45265650872.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc481cc5428---zifilunezaroxizok.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/80100481883.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/39617803083.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/kufosej.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/pivijid.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_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F17 11224 bytes
SHA-256: 682439e71357a941f070ff533a9f08a232d6c6768bbcb1cf76042bc9b56e080d
font_02_sfnt_off0001794d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1794D 17840 bytes
SHA-256: 00afffcd4ad472f7c6f50664f90517b3feac8462fe33a1932e6c4998bd28e292

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