Malicious PDF — malware analysis report

Static analysis result for SHA-256 581e30ce7d7d0362…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 23:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cecb6dfd6a929a2bc81637970f865ee8 SHA-1: 5ca9c0475d1d78821fcac3574c0c82231e077b86 SHA-256: 581e30ce7d7d0362718f8799b8770b5f8ed62670eebbddd3bd531699d70dc939
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external URLs are consistent with a spearphishing attachment used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=vedic+math+formulas+pdf PDF link annotation
    • https://marblobath.com/app/webroot/img/files/52526092325.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/kofupu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/zonibiwerasi.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/dawesit.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/10b82f42c961857100e0c8709d1e5569/14944793514.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/4f09f19b36e1b30c61ae2cea3296d385/69438738955.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7efed86fd92715571a0cd8d8d57071e8/8924073133.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/12414403801.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/41699899844.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/55461704326.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d843b9ce71---fotalulomofavujemifeb.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81d70b1b0---koliluwexaxorokulovi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082afb8a88b8---23203042179.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/942760e6b881943c62611eb04ec78979/59444290986.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vopemalizawevo.pdfIn PDF document text
    • http://axwelindia.com/uploads/bogejiwiwewosodas.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/22l54kr5jk5ojb25nakumn1iki/vokenewaburi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/70204820779.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69fa1e289f---sexaganidumunebir.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6faa7a38d46e584fd9486f57803851ce/kusoka.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/32078826015.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/xenarufojukusaburefovotek.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/fajifalul.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/b23176401c77321cefb2a5af460c203a/zofito.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/89876602166.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092e48164b76---levinogujibezawifonugu.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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10852 bytes
SHA-256: 1d4af9286428599fccb0377b642970106f4e887bff9f9fbc8d089325bc9a6bc7
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 18404 bytes
SHA-256: 22badab23493f4842b2836b5dca9bc3b641e95aa74e0747e9d760d4b901f135e
font_02_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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