Malicious PDF — malware analysis report

Static analysis result for SHA-256 263bc1b0644f6b59…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 18:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c2ac15df7fc0838ac7e388dc0a19af5 SHA-1: 54d13aeb7d3eff266441c4faf4153f3d5bb96140 SHA-256: 263bc1b0644f6b59b90b43ac574df93789f841873596efc4c2e44898a0aadd0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the presence of link farms on potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuanhuaabshanquoc.vn/files/zufalumavatefuvemusinet.pdf In PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/rolinizavepuwuwem.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xivibunojasefi.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/68116328965.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/72785561903.pdfIn PDF document text
    • https://lordoptika.hu/files/files/34111913651.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ad9719---zowomeja.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd78181d79664cf55d22e5ec2311647d/92768998776.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/36341757549.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/munewumijepazemukepix.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/doxenutubodukexeterowo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/907f8d11c07ee054dc3e30d24f542c2d/rosemijefotulugel.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2086e38c---xunefikogiborolal.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/worutaxaguxotefusowosi.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/zimimuposinonijiromaju.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/49965564181.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff53818c7---lobunikewepetivevodabo.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sesakewivowijidez.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/11056153628.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/2668532788.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9c6afb54---59728309430.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921afe4b74---mujibedugunivala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=la+mano+izquierda+de+la+oscuridad+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/daraj.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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 19040 bytes
SHA-256: 961a5a04e941bef4dd22a797f467cd17eb53542b9727ff603f72cc45d64b8f2c
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 10944 bytes
SHA-256: 976c36b5c7b2b76a9f17e15403815a730272f5c605588ed9cd19a904da7eba9e

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