Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5906f0963a77da3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 13:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79bf412ec6610bffafd3ba7dbcef62f8 SHA-1: 69efe7930747310b4893b1ef5c85131d91f9b272 SHA-256: d5906f0963a77da38ee2e2fa5c3ef3bad9934df2defa0d4d9ecd7f08d2a8e5ad
156 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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=perrine%27s+literature+structure+sound+and+sense+12th+edition+pdf PDF link annotation
    • https://agros.net/uploads/file/fokasasuzudeli.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/gigokajewevuvuwame.pdfIn PDF document text
    • https://ckmandarin.com/uploads/93227230404.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec286b0df5---femoze.pdfIn PDF document text
    • https://drsaman.com/files/tarorirutobakinanufapo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cef0e51c---38477049252.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/73436993408.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/kusosowojobifunukurevid.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7310ee53---4580120711.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d36d43e2de---tatezimu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8172547466094213014203.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/redujom.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tuxafebuvuvuxiv.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tijido.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/85833139055.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/vezagesedonepakuporozuxe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6237d51bf58f788834840149e75a0325/wesuzipibuxitoponezudeg.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/12967085010.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bes4n9lm0grkt8hponiabmd284/77255439804.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f754c00f---89647819040.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210604/file/72679463051.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/19963037609.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/46179229975.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_off0000b7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 16132 bytes
SHA-256: c28708f6685dd2ed78493925793a85da92707627a3ba9aac6e305732c832607e
font_01_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 11024 bytes
SHA-256: bbd42e17758f23a8b542a262ef26a04c295a31ac7ff040937aab3390e6fe674b

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