Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c109a8de585b6a…

MALICIOUS

PDF

87.4 KB Created: 2021-07-04 16:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35d07164b34cdad49104f3b241b43bb8 SHA-1: 1203e7a842804b29864050340ec2dd5496d458f0 SHA-256: 66c109a8de585b6ad5c62cf2887f93919f3356c5fafb01309f77000febcaa41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=muzhuval+song+mp3+download PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862c8e13581---34265990272.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fdf4df937---wijepoxixexasigivezaxes.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/zudejutabagobepi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5dd28b0c---zujutunoxazixizegezud.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0b36a144---7771722000.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fbc34691caed5b67f37c4b481c4e3891/96105965624.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/nuzisajezowixazox.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zudawoxuv.pdfIn PDF document text
    • http://bronia.org/userfiles/file/xabasegalakipumesa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5de2nqsrtimecm1p097bbcb6hq/85626311777.pdfIn PDF document text
    • http://dalaichau.com/files/pekusowazezudop.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/kugojisomidufalo.pdfIn PDF document text
    • https://anfauglir.com/images/file/tesube.pdfIn PDF document text
    • http://cecev.com/stockages/files/mamisuzajewotakuwarinolu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90215ab10---99651573601.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c25fb6f56---bidowu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210530093253.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ecc855e4---dizadudaxamukasik.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vgu3d56g5frnecng17ajj1h7i4/67301291756.pdfIn PDF document text
    • http://renovator.cz/files/file/1865488737.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2422cea2cb1e5088b06ada5c621be34a/62483296785.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a86c58da0aebfd169bace4fc8de14eab/bumelugudijivewanetedum.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/35783508395.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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17520 bytes
SHA-256: a3bb2c425fcf3fb18786818ecdfa22be29d8324b3fda337cee334687978d819c
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10896 bytes
SHA-256: eb964726f4d1260b8ec0bb761b9b94b1927d97090877cbd094a72bc88b387355
font_02_sfnt_off00013862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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