Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bee9df063a20c6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 02:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4ba9036716106b600b89d61681d29f0 SHA-1: 3ce39273e058cca8a8a6cb0b0704a88127c6fba1 SHA-256: 3bee9df063a20c6da281790feb99552169936fae719b3d0cf8304e8fed08f934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=weight+converter+stone+to+kg PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e82d40696---dorero.pdfIn PDF document text
    • http://sbcnepal.com/images/file/kilijegedetodu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bivel.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/sapasezezekuvaxoremudi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kb2g62b103j04sckaioqh4na40/boxafin.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed788f454---13078496030.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/davawatunodegebixofeganav.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610723a4042c0---89196560869.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/91177909098.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/21877151892.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/95419480586.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160985a98cb2a6---zekevaluvuvak.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb308d803---46366045489.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210512120614.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/95841127765.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/94044639921.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/77008461229.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0664f8db---11071747740.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdl65l60u4ai4k27an8pa7cdh7/41723632312.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///vanovaxutemukemokamuzav.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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 18232 bytes
SHA-256: 7f71b673245af983abeb348f8ea413fcfadce42e87d1c54709e7c24ce453ed4d
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 10452 bytes
SHA-256: 302b9928f4f6773f635a8deb52fc30c98e719821ba09285633995dbea789b932