Malicious PDF — malware analysis report

Static analysis result for SHA-256 34583276e99d1f21…

MALICIOUS

PDF

87.0 KB Created: 2021-08-25 07:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54575ab1e29bba70af8d86415b3e9dd8 SHA-1: 45dda8ab44aaff3cdca7e22c888632ecd9f776e7 SHA-256: 34583276e99d1f2187eba658a807fe0672431687f53e05eca994fe598031a7ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://philabc.ru/uplcv?utm_term=solicitous+in+tagalog PDF link annotation
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/gewewiwowasidulozixute.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab62978d6---rudimivikokumuxabesoke.pdfIn PDF document text
    • https://kopari.hu/files/file/dunegizusupupusetumuwanu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/vedibabegefofuwumanazileg.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96413f1f9---tesev.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/geuidqvpjh01ood87f1qsjtr11/bilezexolugujarofemol.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/77021673746a43e51791beb21612423c/39537189703.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/62275052899.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3d2a39e3b5cb50fe1ef6e2bfb73c992d/28482474991.pdfIn PDF document text
    • https://nevisnews.com/userfiles/siviwukebawelasagojuvepe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0ede1bef---tawudozunew.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ujbdc93gspuvso22pfgv0s4vrb/gowitigitotevutelaziven.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/nasanepanekudimugejap.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kaderaxibulegiliwozol.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2bd2f6b8c6d3d2b0aa3475b639657e3b/20933776091.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tv2o7o2phredbr8en00o1s85th/4831583994.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/d3eb2b56ac9d702fff3aa1e96c3a4528/budiserebiwat.pdfIn PDF document text
    • http://amdind.com/userfiles/file/74354633228.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/31492026968.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79373551745.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/42293248186.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kenirudifomog.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/60889710235.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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 10348 bytes
SHA-256: f23e5f49ede63965bc13c6c73e37b61ab3f96fd500843aff79b810d0536807a4
font_02_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 16828 bytes
SHA-256: 3a5e6e0e0a84ecc0a4d088a49ac855c5125fed16fe0c674f413f0830d902dea7