Malicious PDF — malware analysis report

Static analysis result for SHA-256 31da091dd5d1e3f8…

MALICIOUS

PDF

78.1 KB Created: 2021-08-18 03:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4edde04ce2392df9a5903b1e38d679fa SHA-1: b55192450f05c62f942b32af2881634244643023 SHA-256: 31da091dd5d1e3f88963f28056a60e315e5b9366de69223d84ad8a39e4b8defa
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://madmojo.com/fckupload/file/serilefanuxazilud.pdf In PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/10792657605.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5ihtiuseevf818m7giku6ac0u1/susuvurewuzudimenaw.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/8092185700.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079956adaa07---802603146.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/xapoxupiju.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/rumimokigilamepijuza.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/08ab67e2f103b29cf8b82eb8e3885500/54002547734.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l3hqm76vhskm7h3jrgncgvg6a7/74852372845.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef2c1d803---68666537048.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a411c2979c8---17773466045.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sapaxasovutu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/10161678692.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/miparo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054c81c8f---xetegutokaxeteg.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/38005693684.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/bovamubefukigiv.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ae5ee94b0793411ecaba683bb42b11fb/sizatunudamixiwu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b410e8dbb7e2c1db7cfef159d7126efd/98304758633.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/54175620964.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bf54a484---tigumiwamipepo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608676347f0c6---77076370230.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/bejidumon.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/xesopodubudomupado.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/xunokinegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gopro+hero+3+plus+manualPDF 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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 17004 bytes
SHA-256: 424f89754adb6e4f0cdd310bda2774a8debee7ea570bd88316e17061318a3932
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10636 bytes
SHA-256: 581b4d603d9fc8815ccc23a340cb09c47f6cac39c66bb8f812879c6f66e3344b
font_02_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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