Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b25a418eb747e5…

MALICIOUS

PDF

69.9 KB Created: 2021-07-04 08:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8a4c1ef09d25458433af41f7ae312ed SHA-1: bb66925d17d51a9dc3cafd33f606c74a5aed9dfc SHA-256: b7b25a418eb747e55ce169c54dca4b9eb08e377b0498393d2e4e674c338b23e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file 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 WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/23c486e2db700396029f26b43ac2f612/72622275825.pdf
    • https://mamotato.ro/userfiles/file/konepinolovopetinib.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d07442ef---6117965988.pdf
    • http://rydelko.pl/userfiles/file/95524332654.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1bba3b36---57394112424.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/vesesakasuxijufibilavuk.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/43616eb505014f8eb3c69305a517290e/fapewixikidujujubumebu.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/siguvobomimuna.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40bfedf7e2---vimopox.pdf
    • http://augustaelectricalwork.com/editorData/file/suzefi.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608575edf18f9---57213412335.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df613e412a---favojiboremazis.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bc6107c2a6fa3ff6a86cabf23f87093f/vebetapezemesefaxe.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/wopalejixejotojakux.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/73849237421.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/106d41000276173a8963b0c2f83c9d41/besavazinu.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4fu2mibhf4ean0h0rtaqpc9d2d/89549459043.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9bfb713eacd379e1642036b6d7a3daf5/jadubemoname.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d81b4b060---56205498372.pdf
    • http://agataklimowska.pl/userfiles/file/3787641761.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e41387fcc---88924674013.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d429963ed5---21012748731.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a472b8463a7dcfcd3273e97ce4ff807f/mepurolikajuriza.pdf
    • http://bajajsports.com/userfiles/file/wopisi.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/eba7a553145cf3a411fd7c8af17d1d45/20634349665.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=2.8+oz+to+kg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b7.bin
4267266aebb6a95f65dcd5f165b30de76e621b1bfbfe2b6d146c3617ada9e305
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 15080 bytes
font_01_sfnt_off0000dc54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
font_02_sfnt_off0000f46a.bin
ab04c37f144cefe834f2ae14b2c5b1c4e2197182434ac671cddde0c7e6a45d1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 9928 bytes