Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e530f57ed39f65d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 13:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfde7019b95018901d40e5ae1d52dc41 SHA-1: 05edfb88447b2784d0751272808a904b57abbcf3 SHA-256: 9e530f57ed39f65d9dc21a172f8a0956bc22515e104b5ebdc1c21b34b7f1a143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload storage or disposable hosting. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://rocincorporated.com/domain.com/images/dynamic_pages/file/zegikekotitotag.pdf In PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/dumixona.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/19664312256.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/98664745221.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5c2cf49ab130320f6cb74a0392c2937b/kuwanotigezolujodotek.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/bugidopoluxufaxup.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/duwaw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079829ca502b---42706206647.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/24316653695.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/17955591618.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5e845b12f---88511737967.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bba1e954---rosonik.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290442099847.pdfIn PDF document text
    • http://119pump.net/d/files/xugofowata.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5edbdbd33d6ce7e50c5c5c0e759521e8/61762558596.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511190915.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/xinapadasinulafinela.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/kapivetinemofa.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/773l1bohjkst7lf7j1aulfjdtp/70403190767.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c6088194---43567017344.pdfIn PDF document text
    • https://activepymes.com/pub/file/getikudanemifotuwuxugu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/caf0947835a19fa8490392f387080d4d/falofibeliginusasuluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=c4h10o+functional+isomersPDF 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_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 10984 bytes
SHA-256: 491946530a8ca5a5eb74889fdf9745868ef090ee1cd69b769ec7c63838c0f047
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16072 bytes
SHA-256: b231cfb287912cbef6f2e67a3d704de8f554621c586dafea27378999a570a897

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