Malicious PDF — malware analysis report

Static analysis result for SHA-256 8201a5f7a770b3a7…

MALICIOUS

PDF

88.1 KB Created: 2021-07-25 13:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a02094277adc6225b70bbaaeddb2b9af SHA-1: b3d6b133f6f07acd378ff1e8ee2daa1a1a877c27 SHA-256: 8201a5f7a770b3a71cdea102d5ed5d78c9594b242eaac9f787f42fd1db24fa8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further exploitation, while the link farm suggests a campaign to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://postelezmasivu-plzen.cz/ckfinder/userfiles/files/lasonofitezogezozozidewi.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/67896106516.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/bodepi.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601194340.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/gogibenalumikumor.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ab0e19a12541718eb113994ebf535ef4/68163754163.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/pezep.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f279a24ed---bomulawarapuz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a09d0840---rijadesal.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/88695809491.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073f20ebe5c2---nepoxogatobabida.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608278e3d41c8---pakalu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076b733b7279---xajew.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9de5625e---78604879670.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/641315dc9f7c4b1512e222b74e61400c/taxaxavigipixeruzijag.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210614020009_gguh6n.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/xudomademuzo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/hv7sm8pma45qjk68ljt4j12au4/biropavisexolozubifaj.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t7g4kb9cc9ale1j51g7jt58a2j/51440168089.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5ca560de5c6abf7b08c6026b0651faa6/63605522480.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/matin.pdfIn PDF document text
    • http://northcity.rs/slike/files/xetubipibewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aumentos+y+disminuciones+porcentualesPDF 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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 19192 bytes
SHA-256: 1b6f459db3bd0be28bc83a029cd76dd405dbeaa2f0abaa1261b1bdec00a5668e
font_01_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 10872 bytes
SHA-256: ceb4f1dac8ef59e979e54e94bc702edc9a1828f4a756b10d8441269bd0545d9e
font_02_sfnt_off000139d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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