Malicious PDF — malware analysis report

Static analysis result for SHA-256 d632661601069e69…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 18:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b6480fd884ed3c46bd592b299564d21 SHA-1: 3066da28edfe0e771ee489a926994eb51c31bd7b SHA-256: d632661601069e693d5f05862572690551a47161505970b52b1633c1288ea613
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of multiple external URIs indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://szermgrt.hu/uploads/ckfinder/userfiles/files/pogijopaniwojevixikobos.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2671acfb---samase.pdfIn PDF document text
    • http://charivne.info/images/file/4213760931.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/dbaba0adff07e5b9587be14f1a7b23f9/guroxibezizapefaxozolaref.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/jerixovadele.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075da8d85427---58628170092.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609fc51ac21aa---birotifapowinugat.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609207bc6e424---bofixefadukoto.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dfbbv69hpe3kq7fetfit4osles/13915946439.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/3316810789.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i7cvcqg1vnvo5h31h25udnr2e7/zobato.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/gavowapivegat.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/57894677526.pdfIn PDF document text
    • http://groupkaishan.com/d/files/nabunup.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/77984596129.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/busomakudoz.pdfIn PDF document text
    • https://haidangpc.com/contents/files/73807788923.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/3767321305.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/552448da3d311c9cb717c55c1b7cc0e9/domibituwavuvikusebavalo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160887eafea02f---10774034108.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/23822871117.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160be60ac3349f---16268357225.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/1175198399.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/27366503186.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/dokolu.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/sapafofujerodav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=water+resource+management+mcq+pdfPDF 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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 18024 bytes
SHA-256: 714471ce31fd96957dac469403d12debc5ee71509c4a553b3476b7ed96f99fd2
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 11064 bytes
SHA-256: 4a7c1a78c8c3109e2b4923c089e5f14b2d324ddf121538d17436746fcb793e09