Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c34830da6e738…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 15:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ba6f11ec491154bdd4eccbc64ccbd105 SHA-1: 46cf155e5d983a09829c760ccd56e76d600cd2b1 SHA-256: f85c34830da6e738d298e443826cdaa7dcb41fa56abd99df1cd5bc62fa13ed27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and link farms, coupled with the compromised CMS upload links, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=download+popcorn+time+for+android+tv PDF link annotation
    • https://granitnet.hu/editor_up/bagideliwuxuxopogoku.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6d9a1a5a---85360956744.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/36286377198.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zojupaburatosezuvigag.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/70539139571.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/saxeko.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c6afa84aeb01376cee76e46f8c7aec05/pewuzewosazuwisubo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edc68a3ddc---fibupebizesep.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/51089769249.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/nufosuwogeki.pdfIn PDF document text
    • http://silver1979.com/upload/file/mofisowupubalizavoluvop.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/rotepojadokinixalesu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad203f64---lemabenit.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/tajati.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/45021279291.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/10801928285.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zuvotowenibadatazimini.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/zifunonemizenepewivo.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/52723232937.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/kekabogiva.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/vadenipini.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec6808b201---babidixasavidunosi.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_off0000ad72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD72 14416 bytes
SHA-256: 7ad80264dc7f91c319580104ba00cfe5b61e0a2e2e5b591b0cc3bcd9d582e256
font_01_sfnt_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 10768 bytes
SHA-256: 04c2fabe659cc4114690d722fe3148b089b3f780d71f0af1a99132882f19d9eb
font_02_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1