Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac4e69c94710fa6…

MALICIOUS

PDF

93.3 KB Created: 2021-09-11 18:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49a0d33e3ec2bc7bab709a4936b0ef79 SHA-1: 53315f4105261c07ee9488cd9d135b4b41fc1871 SHA-256: cac4e69c94710fa6bbf38953b8803f6072fe72de18a3249ab2ffbd084fb548c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tahyuh.com/uploads/files/202109042016336437.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zabofujude.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/69771764493.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/jugozopigobupukal.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/22825096512.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613108ed80e55---69728459574.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kujukotipafutajewezo.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/19843988776.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/surixorobujeziwedabukinod.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/bubonokulefip.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/67989876774.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/87057798199.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139c314b22c0---77002502857.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/ponejojitozagukofune.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14619584---40364130305.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/fixet.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/55201933053.pdfIn PDF document text
    • http://innotack.com/userfiles/file/tuxedafebav.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/84156491201.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/67486111922.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13306800857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+voice+in+messenger+call+androidPDF link annotation
    • 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_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10960 bytes
SHA-256: 5548162266a1309ec6f4978f37a42cac05e2ead40fc4b5bef9489bf758375b89
font_01_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 18004 bytes
SHA-256: 47046b333972994737737c004ff4b3c66c1c073a716f4f61d667d99ac1f9a1ad
font_02_sfnt_off00014f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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