Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d9176bf51ab3b3…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 23:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce668cb55f4ceaffbc5ed2ee1786435c SHA-1: 23be9fb1e83dcb195a7a41a47993420aa4442570 SHA-256: 72d9176bf51ab3b3d5f49a90a46b71bae9dce1730ecd98d929d44283e7efc655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's structure and numerous external links suggest it is designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dajuicebarus.com/uploads/files/furisisafupobux.pdf In PDF document text
    • http://manixcnc.com/ckupload/files/nobuviguzewexuzomodewe.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/11565969411.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c132a215e3---sexokuxarafijisedemekap.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mujofudoxigalixi.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68f72bafdb---18197169460.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/ropuzisusaxisogaro.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/91785436259.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec547af7ae---kozuv.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9818f2ac8---4830471415.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dapivinarewobimunebuvekap.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wuvudib.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/lofesiwege.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/7465822978.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/patoloduvurovokezafimip.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/50677774975.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c29aa46e---98508274228.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261a861eab---noxutokeboxudap.pdfIn PDF document text
    • https://emmaushuis.org/pages/73195126976.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/nazemukusixarunojosawusok.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pubanuduzaxuzozu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f76e0ca66---1763622298.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085282e045e2---sixuba.pdfIn PDF document text
    • https://almavilag.hu/files/files/7549712583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adios+strunk+and+white+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_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 10808 bytes
SHA-256: 65bab819796a3915f650d4b7d9357475a60e34b146c75457e75713ee95e08fbc
font_01_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 17816 bytes
SHA-256: 4066824fff8129299fdef0a1c6a0586cb650f8300751cbf6c2f6e4860c27e484
font_02_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1