Malicious PDF — malware analysis report

Static analysis result for SHA-256 941d08ed13a5a224…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 08:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2599f966ac9de169877f7fb758043891 SHA-1: 1b2f9087651266c81f04fbc9f35518e3a327ef6c SHA-256: 941d08ed13a5a224a2c5e47b46577ec212385b90a62d287583aac75787dd3bbc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=what%27s+your+personality+color PDF link annotation
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/90058415215.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210808021242_j3bcha.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/11829280539.pdfIn PDF document text
    • http://0930actress.com/files/files/tokapivatebipan.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/tovivobej.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/86845834769.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607718502e131---lanerepujal.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/fc1236803ae03408a4aa081cf904cc8e/13463081511.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/12f22d5f2b215dfc58e0af8987a9f04c/20014032467.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/27614190932.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nejivesimonajo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceae356ff4---44056391723.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e292b1a3716122feb63ca6114035d4ac/zuvitobegijobomilugerafol.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/dororitam.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/96242612124.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160923f65a5e35---42302114750.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942de0b39e9---lixazedegepe.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f883369796db1c3d6e2a7af551eec9ff/93190380349.pdfIn PDF document text
    • http://farashimirooz.com/files/kezutozelipomexogoba.pdfIn PDF document text
    • https://congchung7.com/upload/file/67684539062.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/gorudexebejigagovokumolel.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/36385866651.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8882f667d6df8ea36d138f12501c3172/navogot.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/99453090487.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/24288262051.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac32ea092---gikemarugofumunojixudimu.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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 10712 bytes
SHA-256: 3bb458e9bb457f6998c8f9180332089726d49237230be03e657b017b2fe264e3
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 17968 bytes
SHA-256: 082f93f21f505363361eeeb85641960c4d73e504cd11edad046144a481975d9c
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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