Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcbffd318e7a6d7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d22c78688ab380014a54b58266e5633 SHA-1: 1fae56956ea24b5370dd8718379a0cf3466a867e SHA-256: 5dcbffd318e7a6d7c9b8757baf63567594e141163d47032e9afb9ae152a18267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm, with UTM parameters in some URLs, further supports its use in a campaign to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=sonic+dash+game+download PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/tesiwejoxafoximigepidalu.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/bapasefasip.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/93844508293.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/11362864599.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/91794418695.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/45285582639.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/40719759217.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/60064095288.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613105b63dcd1---66181365712.pdfIn PDF document text
    • https://0900107678.com/upload/file/dopafoxe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gt27qot7dvqr8mbjqsn50uhnk3/82313124353.pdfIn PDF document text
    • http://keacg.com/upload/files/23013127531.pdfIn PDF document text
    • http://sciattella.net/images/file/97016348511.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/kilibar.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/97792600532.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vuguwezilijereburimik.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/zuwewofo.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/30511958604.pdfIn PDF document text
    • https://anakmeong.com/contents/files/76675064265.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/37360858255.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/lawovosutojusagetopuxa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/290a36e554c6d4ccd529814e3a1c9e94/89386783547.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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16948 bytes
SHA-256: b999effbe5882111eb5646bfdb1e1a188226936e33dc9df9350f2bf2885dd54c
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 10780 bytes
SHA-256: a459fdf60ea92d378933ddad2faccd93e4cdd3099ad9e639f6fd1ab806ef6998