Malicious PDF — malware analysis report

Static analysis result for SHA-256 565e8feb336ef5af…

MALICIOUS

PDF

93.4 KB Created: 2021-09-05 00:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14bbba0bfe7394c73ed0c76843982388 SHA-1: 6c19834cf5b041ae3844053917a4118fbf629396 SHA-256: 565e8feb336ef5afa9ae7fcdf1149d02c7e6ad3f2843bce4d12cdf62eef571ba
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44ab7b054---10319566397.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/sibigakus.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c6a2f807---6299732087.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/11ofgukg20k279dgbat65st3u6/44515382030.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c574ljnk7jm8ocld5vb2pp5ofh/faxujine.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/fizovufamedofolelodem.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/60648756757.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/puvonibelanim.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/xisumidibalusepugopixaja.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4fosc0238eg4l5mo3uhmlel7ag/fefaduvuvixusod.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/71332670439.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3ec12h3s1ofg8p0k7cqbbs6akd/wibodukafuxi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zinexizepoluburimarenave.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jidaxu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4250b5fckr11hhr7egttfap5db/86082717847.pdfIn PDF document text
    • http://protok.pro/upload/files/bivagizu.pdfIn PDF document text
    • http://envigest.cz/upload/file/gikeko.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/resizikipojipig.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/21200249794.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/godevizowabot.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb87228dc7---ludigisudotox.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/256fb1aab935c6ee3fcb22c1c5139c51/zavududoveruxelomelip.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/27002752412.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d04372210d.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a62a33dd---fozepafazofikepa.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae70d969a---xononebibotixezufet.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jatusepetatedaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cqg+symbols+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_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 19392 bytes
SHA-256: 48de4ad6716e1d0de127735fe9830e978072fe852767e10dac91b4c178925a9b
font_01_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15069 10584 bytes
SHA-256: fbae1ee2512fcd5d0d695da1286ce2067ce6e46cec910205c3fcca0887d10f6e