Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06e4dde88bf3bdd…

MALICIOUS

PDF

77.3 KB Created: 2021-09-27 01:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e64a49dd7c05c407eeb2930128e73674 SHA-1: 3765d9db79e9890758232be94a855a9c21815e98 SHA-256: f06e4dde88bf3bddeb01faf6e7afff9f9a5e0316ce0a7e5af7b27aa854d373a7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious sites.

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://archism.ru/uplcv?utm_term=rose+symbol+copy+and+paste PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ahjnmos7sgnmdph78b60ise8o3/kijekuluzotobadu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614f1a7ea01ac---67158931113.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/kenitisejemegogika.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fopokogireg.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/71514894485.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/manasitelataxobivunani.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/51799691721.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/sazegiwuwafafiwegeniga.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/62i2hmknh7ggp2qg84i2ktjuo0/gevatakidasolozatinuwasa.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091110034786.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/kojirozajewuxexulenavas.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/rekidabixodejo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/kojono.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/39cfc8438a12a2a5dbab346ac90525c7/modovatu.pdfIn PDF document text
    • http://capital96.com/userfiles/file/93802300924.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/72972609573.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/75728617585.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/75464220758.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/tifapisawugimofodulisol.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/leradigu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gijumodojefekuwodosadixo.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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 21096 bytes
SHA-256: 929f30739fdac5804dd4e92b1581bae2342e6d30e429ecfaab78785d99357644
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 10784 bytes
SHA-256: 873f02915bf59ca37608cd8e0c1f31a725f4d27d78dcd214b8b3a534fb3875b2