Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd62d522ff2624c5…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 19:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1470f15bcfece6aa7328fa20c33681fd SHA-1: 5f0deef0f5967cb5172eb26722fde03f4ae63d3a SHA-256: bd62d522ff2624c5fa61aa9f1b4f45329fa518e3f82d486b3cea6e49dc2fa378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bluelakehomestay.com/uploads/image/files/xusafowemelevufew.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/sixib.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/58029597224.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/dufimilibiwuxemodaxuga.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hnjmo8hlfqs0u6hccjd56ojilo/movuli.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfc001c7fb---29628541204.pdfIn PDF document text
    • http://air-con.ru/upload/files/89078416939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ccf736a90---58712741063.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c189fe972c9---xurugake.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/46150579320.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079881376ded---99204270799.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/zatuwewefenivo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/02f9245c20318699e1bfad66b611d820/66118798172.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/87011226532.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/388683c9b006d54e1f6035c6fa39a0c0/jakukodoju.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa318dc1c3a7814f04260b26995e47f1/67666380164.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vixinekelebosedov.pdfIn PDF document text
    • https://educhina.mn/editor/files/xapizajurikarafiwomidugi.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/31175822136.pdfIn PDF document text
    • http://parfumkin.ru/files/files/kutit.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e9ca9a03---bemovejabemav.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85169d938e---vomarolarofoveguxuso.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2106300405539582608zwcn0.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/sarawutigobererepixok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gautam+buddha+biography+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_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 10888 bytes
SHA-256: b0fc0460e2f0697b5d6ed323b1c282779a8d347ad6c25bf2134f0d4a8c91003c
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 21520 bytes
SHA-256: 77d1afc26d54c07ac119b9e6258068d782e2890256460f42bfe100b2e1a25fa1
font_02_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1