Malicious PDF — malware analysis report

Static analysis result for SHA-256 e545d520dbed453f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 12:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 529d609f9dfda7c45a9bc4232a09aec1 SHA-1: e5d5b7cefda45f26770c78b1a8bda8c1ce099970 SHA-256: e545d520dbed453fca58f0b47a2d7b1c830aeafb844467347edf6777bbdc112e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=financial+crisis+in+greece+pdf PDF link annotation
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/bodofusa.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/didug.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/097cdce62586308abd05daca7465de12/84936574590.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/78320773347.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984be644dad---70664005519.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/73671396717.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/40655167520.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c233c699977---pebadofevavok.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6102139832.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/zezewinidupezigamud.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e1f4224f1---78558087195.pdfIn PDF document text
    • https://soechi.id/userfiles/file/74593929073.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/19084859532.pdfIn PDF document text
    • http://esangsok.com/upfile/files/6419239874.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2fed55a5bed21a5e958e6985d2766046/jadewuwaboz.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/54889366088.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kegevamurabu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e5085d52---41724184978.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c52cafb3f5a---39970808038.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af846281fbf---wekelokefun.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/49234068204.pdfIn PDF document text
    • http://billsky.ee/files/file/xufoxenewomekogejanelevat.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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 14888 bytes
SHA-256: f4efa228035b86c0b993991457f1d1da6dad0d766ff27acc6a6861850f7801cd
font_01_sfnt_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 10552 bytes
SHA-256: 8ed17a1d8c6cf19606d99def8cde72edc88612f77d65122764d5f299ea7f2c16
font_02_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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