Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fd4bde50e921de…

MALICIOUS

PDF

92.0 KB Created: 2021-08-05 06:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3852ffb0762dd5572db96714e8d58dd SHA-1: d8336ebbe5dc5e7e7ea4ee2c9eb18682eb7ba6f0 SHA-256: 08fd4bde50e921de1848613d3a40b58ae4ea587df9bcaad972f9e62af3665e85
156 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 functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of external URI heuristics and link farm detection further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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=watch+shottas+full+movie+for+free PDF link annotation
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4fe42f84cd195d42802247a2a6347487/jelopofilazokukoxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dab5ed573---pitataroxetivapavebuti.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9feed14c2a69dda8bf163d29795b4043/wefexibugo.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zupolubapemekeguduf.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/muduniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626816b31c---ramudebuwenewopefowefizid.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/xobepikaxova.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/77778595863.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106190951388385.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/komegugiwep.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/17221e47d146c4dfd2a47efe0f871645/14792158913.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/lexufuzemonugonufokuwad.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/667976r1jpu23ke29hlvmca6ik/11962461452.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7a0a1f72---jodugidibil.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/74516390674.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960b14d8f93---geselam.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b62c50b8---jakodokuxivorolevar.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/buraroxiz.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/rebifowewusixevawulazakep.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vobukiwarevetolare.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d68acbe35---musuz.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210706_A76B9E06B2695E15.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210714_CE0F07591EE3003D.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/56887379393.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_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 17024 bytes
SHA-256: 228fe4e62a5575416bfec1061076142c2dee9483846a2a5bc3afb4caa6a2afb1
font_02_sfnt_off00014782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 10656 bytes
SHA-256: e26f347bf18acff6272a7b80a43e372bb35ce6610e6e1b7a1d888761a2cd40dc