Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cec6d355c9094fe…

MALICIOUS

PDF

92.9 KB Created: 2021-08-07 18:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb31d228bbfe22cd59779bd5fad8f730 SHA-1: 1a749ef2e7ab75e43ff13efa62ffbbe68179b676 SHA-256: 2cec6d355c9094feb5105c9f31d97273577f82441fffc9eb87bae11886bb902d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL structure and heuristic firings.

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://butterfly-propertymanagement.com/userfiles/file/88898602093.pdf In PDF document text
    • http://htwy.com/upload/file/15872838928.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/13806681ca85f73b48962247fd0d1837/42211321566.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097116b850fe---wipobi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda2f77945---rajegag.pdfIn PDF document text
    • https://menu2uplus.com/images/file/35298161808.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d6273263358dca8d21c6ad3ba07bbdfc/97368742358.pdfIn PDF document text
    • http://ashioke.com/images/library/File/mekupomevenopagirokofi.pdfIn PDF document text
    • https://digireg.se/upload/420394889.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/40821626768.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5fbf3f55---pawuwaneroje.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r1fun8dc97gtskj3rnoj2m1vk7/30751888362.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/nimog.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/bikojofitamotajovudawus.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fodowidepiruxojew.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3257de47---39655578638.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/13808566546.pdfIn PDF document text
    • http://tavio.su/files/file/73387441527.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/19014485304.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qsa4lq06at84kqtt8jjkr3au54/80021831985.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928630169de---45743632800.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tapafurijoxowivaj.pdfIn PDF document text
    • https://digireg.nu/upload/resejevixitajuposidupaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=building+materials+and+construction+technologyPDF 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_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 17760 bytes
SHA-256: 9c0c246541b3f4c690472919f762b56d9de07a4d5fb9a13968bc759451edd2b8
font_02_sfnt_off00014aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEE 11084 bytes
SHA-256: 3a0ec066e9470c3d343a6ccf25277c1d481eeacce681f376f14eb6cd058f308c

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