Malicious PDF — malware analysis report

Static analysis result for SHA-256 3382773a8aeca910…

MALICIOUS

PDF

126.1 KB Created: 2021-09-05 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 164751c0415836b816bf258d912ba6e4 SHA-1: 57ad5ab2f58c918b7ead5be1e749336d3e882f9a SHA-256: 3382773a8aeca9101f5a5aaac82ae929bb0d4030136c4da4e89bfeee7ffcb83c
244 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, specifically a browser extension installation lure and a fake download button, to deceive users. The presence of multiple links to compromised CMS upload storage and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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 https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3055138237---64635876983.pdf In PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/figolutazupexudosogivirub.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/venotiwokop.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8d69973053f3046cd8c618965bddb914/kasorutotag.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa7080aac---zuxotipulebogaj.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vl9k3v2udtcp48l9lf77btj846/90029000898.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/af3708fbd872356989f9508c9e159b18/54946593757.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4a3d30715---51606244606.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/jexumimekoxalob.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/48302491747.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-31/20210731024204103597.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/48071549545.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wikelubepoduxivunugudibob.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e796f4a7f9---86605649317.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/37cc0bb7d2748b9737090569652d9aba/63555285651.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/277fe472ae0957f8af2a9553d96c918e/30025518029.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vivesodadagalafirel.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/af21e357e130bf08752b2375ba30bb93/69809838610.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4d43026d---jivoxafive.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607336dbada8a---mopawe.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/97023284683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interview+questions+cheat+sheet+pdfPDF 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_off000185a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A1 11020 bytes
SHA-256: 6f0b17c2876377ca2c670484964da54a344b2434f83271fdf4d0b38b1d1cadd7
font_01_sfnt_off00019f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F0F 19136 bytes
SHA-256: 905c30a06f6de221133c8e609a4918e7d696f34b6e27c8fa8c305ad3fd50b667
font_02_sfnt_off0001d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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