Malicious PDF — malware analysis report

Static analysis result for SHA-256 58962c6670a6ff2c…

MALICIOUS

PDF

84.6 KB Created: 2021-08-08 12:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 09e8d4eb3df848cc687c2a00022eb724 SHA-1: d310f7f9bd9bf282375f1144b0b4595db599a9f3 SHA-256: 58962c6670a6ff2ce79cd7d08aff34e5da7dd4fcf305702894143f2b85f90ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/609hclo8g6b1b8eobd72rg8i87/waxugelexozotuva.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad68587d8---77324742426.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/komavedutumebemajolusif.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1673236109ecd0904c919dc217416efe/73998779489.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/voxebom.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4b5fa1cf17e346686e314509d6f2f7c9/rewokoropedisemesa.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/83546933848.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cc6f0ec4d7c9e4e21d929e9e2ebd2590/31135325434.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51a58fb6f---97484678066.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/89004370063.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///piwag.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/mofikuvewalawisum.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/99239333923.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d06417fc9---fajadi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kogadabotibojujo.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/rarilikinididasanafag.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43d3b0511---15110428363.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4aa6579c7---76979059096.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/52682000680.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/mupoj.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/66643052359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=we+wish+you+a+merry+christmas+piano+sheet+hardPDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 17844 bytes
SHA-256: 3d967f428135f1e825e1ab45653fc8773f6e1ea6ce99d1f44e6826ca6f0c0149
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 11024 bytes
SHA-256: 1ca367caf84f487f44c0d9f2c40e8e7a850e7da7771a0da9f6420ac7040e96fc
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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