Malicious PDF — malware analysis report

Static analysis result for SHA-256 864760cd165a5495…

MALICIOUS

PDF

80.7 KB Created: 2021-08-26 01:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5545be9351af17226a0e25705181c09 SHA-1: 71440ecb7dd88f462fbaaca2abea5c329dd1019a SHA-256: 864760cd165a5495420528fa54917f267ed9878cf9a048fd8a7227dccb23057f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to phishing or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=how+to+convert+picture+to+pdf+on+pc PDF link annotation
    • http://contextuae.com/resimler/files/pipanamuzumoxikawa.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/rarelibuletogowonox.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/34dd3e75b2bc86fd310e54e6a424c8b8/zejubedakufozotatijagig.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/15d7219d7b8e335be2eb38f4a042a056/garivunilegonubusid.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/wowerenesokeguvifu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719fa78558---pareduwinufibaful.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/0jv826199o2bglh7vfsgs9a9o6/bivevifobivaxuwakifivi.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/32190587234.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/ratiziwivewoluniwuw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5160d236---zonifazopumafejar.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9rep3fns2eah88i0j2qe180njf/labosurolejixolage.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/lakekug.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3348185c9e3e08e640990a5d0715abda/muxelogasubomukisok.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/58146665815.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pibumup.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xoritutuwoladuwodifonexob.pdfIn PDF document text
    • https://stvorki.ru/files/file/goguvuraxutinegasaxukon.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/juzorizadimake.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/83747930330.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cccbb52ebd732606d76d7882b422cb22/rudixotegesudisasakidisa.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/71673217575.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/movetesig.pdfIn PDF document text
    • 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 17200 bytes
SHA-256: 133693c25890afa1794ac3b6a0802a229f8287d24b8b4cc321ebd6800a56ba13
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 10480 bytes
SHA-256: 7acf7c76d526b978e39acc6da5ec6217569ca8586be2762188f396567c9cfdc8

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