Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac4999fc7bd8128…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 17:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f744b37d5079bf4ad6d3d4df6b7bd89 SHA-1: f63167b42b50ae9e65fa8d77fe51a8fe91d7488b SHA-256: fac4999fc7bd8128de36a0757d76da705088562a80dc2a913bee072edf82fb80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://machinegroup.ru/img/outer/files/77617969097.pdf In PDF document text
    • http://birudongker.com/contents//files/34997279547.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/mafoginiwixapilatixemud.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///gitogovabepe.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1019070f9---64323662492.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/24553436810.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a24c2eb1---26618862400.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/77599860332.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/08/21/17982701971.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56c89578f---nilanefodadi.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/davebuxasazuxig.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15ce7e712---99865443339.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4bc9cbab54eee6e8dd6fb7b39f13a733/7392900894.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/xudiguz.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac190a0675---21530856304.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/9390168350.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607014279bb47---31303071754.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e1af3deb---92054488782.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/lazonutile.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasawelasupamu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518001124528231.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/jitebaraforazetina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=que+significa+una+media+luna+en+un+mensaje+de+textoPDF 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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 11108 bytes
SHA-256: 3604eab65f7d70d4334275914a87d0d7ef0efc9e15bf70fcefa21edbe30f4914
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 18096 bytes
SHA-256: 5b7fb22a27c4ff43e8222bc092f8c5e17be0621905c2219dfa9526984623dd51

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