Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ccc5d4aabfc86f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 02:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 072fb67d597449ad683c427408efa75d SHA-1: 9510aa1e394fe1464856f92f648d7fe297181579 SHA-256: 77ccc5d4aabfc86f2e4dd463835d1d769be2c4a02cb2fc12fc7ccc03f36d413e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=sky+fighters+3d+mod+apk+download+android+1 PDF link annotation
    • http://massintech.ru/img/outer/files/mukinoludovase.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/toneboximaletirag.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210915_25DEF5A92E0CB9AB.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/dakodujifekasovuk.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/fanozame.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/22135136427.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/fofigemuves.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e35u22bs2pdve55g42efletus3/mozojepik.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/7831296251.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/toxobiwapujaxujelaf.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/56151164808.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/81613454278.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/99868288760.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/95246235656.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/85818063773.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jv3g2pejqvclehno5i7nfmfjsg/91955683162.pdfIn PDF document text
    • https://menu2uplus.com/images/file/linasunemumaguzusotutuv.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/dakurobimonutoberofuwiv.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/burejewenagenad.pdfIn PDF document text
    • http://hmed.vn/upload/files/46903080237.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/koraguwarufotamo.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/84091181004.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df2df40a3c---fezabapiwodixilafunoraxen.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/detisogemekiv.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56b10633d---99774376037.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_off0000bc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC97 15972 bytes
SHA-256: d0d6d2d7841aac70734443aeb7de9972bceb3e97f354f56d57439304eb69ca14
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 11536 bytes
SHA-256: 60386bbcca488167086ca89eafeb304981d1185ecfe61e5b6d2fba3088434c11
font_02_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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