Malicious PDF — malware analysis report

Static analysis result for SHA-256 4922b9975aa441fd…

MALICIOUS

PDF

90.0 KB Created: 2021-07-21 14:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b47752dbe58306118aab84841d9c8b79 SHA-1: 1c05e7e9a2d74e8dac028ee9438eccbbf11050a7 SHA-256: 4922b9975aa441fdf572ab8a3380ab9f10c40199e0a2dd4662c72628b06c2a06
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The document functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect the user to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trustycctv.com/ckfinder/userfiles/files/1527789139.pdf In PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/81333617035.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/rukitete.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/kewosederaxolaz.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/terapadorebivixekatoko.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5eb47c23a477366c3ed2dec8579a362c/12894941018.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6io97mfp3s1dic486ava9qpao2/38040888812.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cjt49dt559shl7110ltmrr5n5l/novuzuxufokonazilag.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fisuregopeje.pdfIn PDF document text
    • http://geose.ru/userfiles/file/74228261027.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/varonevukigokexiwawekut.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69e79cf76---99474003997.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/36299291353.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/34034998939.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/155b6d9d04978f98055b895411dc4941/zodaveguxokuguxip.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b4c0d24d---vuredizufutevidiwagib.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/tasave.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d5d5577a---wogazuxabozid.pdfIn PDF document text
    • http://aurora-c.jp/files/files/27944314957.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b29edfd29ff5f3abedae46e5de3a1b90/nigemokaserujamelabugidak.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/wexinebiriv.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/gajopusekawatujirinupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=current+environmental+issuesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b3c62509557a6ec5ebd3ec8e1536a10d/31998521139.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_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 10464 bytes
SHA-256: 406d2e2159435d70a9e4ca7e9944dad9a35fe7e617b1c7b2bc4a8d1751f9a539
font_02_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 17428 bytes
SHA-256: 663da19703b0a94930f862c34d08f37d54f72a8e6f1020f9d7c13d359be4d2b8