Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d69c54df9736c33…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 15:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66a24e76645a50d0f737c4cef917c1aa SHA-1: 9682953272515fa4bfd23bf3dde0c526815ae378 SHA-256: 6d69c54df9736c331b99edec466b100da0ab22f3ce62d9265a181c6804a5c704
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution mechanism for malicious content. No scripts were extracted from this sample, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=best+dark+theme+app+for+android PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131afba25607---68864484479.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf1db61a3307171495c39330e9ae6798/88994410827.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/datepunafesunevorovux.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/5524605360.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391e1adb949---12745226738.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fcf06b7726900f94266242996b4dd787/71337890725.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/lifig.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/97562643194.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141115a44635---sudasowi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161392b11abf27---zozolumalogovexixi.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/wimifezinobufine.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/midumimaf.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/88667091029.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/49483212434.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090917114563.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/56784426907.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/55468140411.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/liwogufogakegema.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/66458944209.pdfIn PDF document text
    • https://slotpt2.com/contents/files/wowudowowevewi.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/sodinonexesiwakudusijo.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/46922483376.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/41973915125.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/feriveluxa.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346c16a9e45---nimegibowujodaba.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42690311831.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 10860 bytes
SHA-256: c44d899f86201c1d0e085e7467ef573c4fdfefb38e265e44c809624841857911
font_02_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 18820 bytes
SHA-256: ac5cc5c304259bf75e5fd7f33751fa97522239706ba5660e7c4deca138c6220d

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