Malicious PDF — malware analysis report

Static analysis result for SHA-256 13565750d8244fa6…

MALICIOUS

PDF

68.2 KB Created: 2021-09-03 12:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2e747aa5f6779eeb8ab0afa05ac35c5 SHA-1: 36bd0fcefc7e01b2a00d7aa119b8cf852b87612d SHA-256: 13565750d8244fa623e2b7bc9663ac89196481f864d00f48cfb49bb11aa5d13b
154 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9108

Heuristics 5

  • 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
  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608615fb05771---lufolifipaduxalabilod.pdf In PDF document text
    • http://savvyais.com/userfiles/file/pukeliranirapixu.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/19217150287.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/pozubejebezek.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7c060a78b031fb6923d0f382a15473c7/jatatemibojaxopomorubet.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/6155521077.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfde27e28---ferize.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8887d63fb5463d090aa7085b7196703e/jubosupewosafapa.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/xulejoxipanevejolufesaz.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608452006f5bc---mesofibitagomakivowi.pdfIn PDF document text
    • http://agavietnam.com/img/files/76758005480.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/walazixonasoxovatixexam.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/51856635396.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe14082344---forefuganepof.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/be0ef97cd66a1ff960026d797f77726a/6778979500.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/31597566196.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c44cce12e6a---sowebafe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9b900b7b6929d86276c4d6f2a5322c0e/waxaviratitixewozaxuwofi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/fitezepum.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cce1a4c6---mivepejusugonupefitexinub.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c95181ca---67900108977.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fecb98b5---54965534689.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4r7h8cpg9l2e1e99fpii446nbr/velozovesimawupemez.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/17240252073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pma+entrance+exam+reviewer+pdf+2019PDF 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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 17932 bytes
SHA-256: f50b3ef5e3b04fabdefcf391aaf879caaf2defb3d4b944d2e68d02e81af463cf