Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2525ae16699958…

MALICIOUS

PDF

103.0 KB Created: 2021-06-28 22:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d11c290a4d6d0874a18f77d47aafcfe SHA-1: c8aed36e718f4042f8f1eb03521df658521f4924 SHA-256: 2a2525ae16699958eabf827fbd0a923e034d10f6b148f6ce85c8e1beb2a855d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the structure and numerous links suggest the PDF acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://shinies.ru/img/lib/file/bogotisogifewe.pdf In PDF document text
    • http://kapli74.ru/upload_picture/vaxewel.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160704cde3c753---74671957294.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce61e6f472---77333245282.pdfIn PDF document text
    • http://sport-way.ru/img/file/25111159847.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609590fe1cf37---25744424823.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/26331577113.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6049c10e2---vunuxunutuvi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/983a9c66b2f555d3e1bf2f564abe4cb3/34079100512.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b40dedd2---xisukajasasidetijavona.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a71731415---xutaro.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/34837618350.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/warizodomaxadixez.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/femixaforagupaxunegukex.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807a36a89ef---16678783580.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccaa140ce---zozibana.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/872386516.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/86016639528.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/vatisutavu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b452660665---43648640971.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vkjk4e8p17h4mtuk3h981ps3re/66923076945.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f805c6bc3b---30093620517.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p0iqjoftinbi27d44fkvjiu3o7/fofitizotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=operant+conditioning+journalPDF 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_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 17708 bytes
SHA-256: 6412cff4f910973eedb814c6ae0e86c65bb192641bcb3b1aafd96fe6378cb1ee
font_01_sfnt_off00015dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFF 10776 bytes
SHA-256: 38e48ae0def28f3da8278894fa6728e97a3acce93c6f83fa2f33e696da0d116b
font_02_sfnt_off000176af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1