Malicious PDF — malware analysis report

Static analysis result for SHA-256 936813786d61e8a7…

MALICIOUS

PDF

62.2 KB Created: 2021-09-06 21:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c420760206a9a8ac43f8c316c6768053 SHA-1: a8df4ae8ee8d23e6efc17653ad5a1668bf28446f SHA-256: 936813786d61e8a7753f1a0a67f3a585b07c1e8d3ef302a87bc68afdcaf67717
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress uploads and other domains, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5125

Heuristics 5

  • 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
  • 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://xo-sound.ru/userfiles/file/57378288765.pdf In PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/sazunelodokososuxukilibes.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8ef3daddab31dcdd379ddf55991aad45/nuxamerevagijojapevetuvu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5tik4csekguefuvve2uf3uv6uc/9886974235.pdfIn PDF document text
    • http://minhanh.com/files/nexomaragugiz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d73ebccef---53620317560.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/bagirexenimazevewebutuk.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8fa52a91---debefonaseresulufewaxakev.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fa02a19a36b76f930cf1da43bc6db7da/30299967068.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/aad479e27a0e470e863b7f752e75e0aa/jejukomadeloxamagev.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/rujekivupeke.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/wizarapinuz.pdfIn PDF document text
    • https://parfumzone.ro/files/file/10343010477.pdfIn PDF document text
    • https://anakmeong.com/contents//files/joxawawinajupanofajimed.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aa79974d80cfb5a190a0a7c44aa542a0/23421464252.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35d7f15f71bad45d3e3d258caf161875/figefonolujeweba.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ui53ram4k8dulpjmjc1l69vh33/dowuraramen.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161118876ab74b---89904053964.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ranetomomowexiseroxalade.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841fc1f320---zavupaxo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/3da9c94843f9803c4bd4511504788e7c/30549756475.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f2104a1ac626e061ed85044afbfd80f0/zageberuparas.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1fdf7b4202d874fa5d1186e9df37ece6/9531800284.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/duveleget.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/26120332459.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd068df93---navalejuzosenodarazenilus.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/198rm78cmiu7terok1msl0vehi/sexepenekivapenuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=present+progressive+worksheet+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1