Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7c116cf440d0d0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-22 10:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9bb3803707b5b1122f8c8034826ae63 SHA-1: 536a0636169461db675a5decfd13af68fc98868f SHA-256: 9c7c116cf440d0d00e3711f5e393532ef070d2532f7d3e268081428505b3ccf5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dentalweek.eu/userfiles/files/13510420755.pdf
    • http://xn--aknmedical-yub.com/uploads/file/bedapifitinalub.pdf
    • https://foulardfotografando.it/file/20732506932.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9289140b93c79f5924f54d2b2e6558f9/42606915031.pdf
    • http://pokeocncafe.com/uploads/files/mewenobolozagavimavorivuz.pdf
    • http://jsqnchem.com/upload/files/latadetaresafusep.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/fenenewu.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/95971627731.pdf
    • http://hvezda-pardubice.cz/files/file/newasuputok.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fikebemevodawogorare.pdf
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mijitiluvijupur.pdf
    • https://armagedonspedycja.pl/files/file/dupabetokofotas.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/dufadewemamukagukujezov.pdf
    • http://oresteruggiero.com/userfiles/files/57114433767.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613155e77cd25---70358587753.pdf
    • http://sandlnae.com/data/editor/file/18139359767.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16146e86c79a13---tudulimujagaxuv.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/kokodalizatafewojuzu.pdf
    • https://drrajanmahtani.com/userfiles/files/tezusanabikomaturupo.pdf
    • http://sugarfree-gelato.com/upload/file/96054294944.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/74311530118.pdf
    • https://ksdc.in/userfiles/file/bugel.pdf
    • http://elfobchod.cz/foto/Image/file/lufiximep.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/sivenizo.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/mewukebilarewajewosasifo.pdf
    • http://areaengineeringsrl.eu/userfiles/files/31482424016.pdf
    • http://baovecongtruong.com/upload/files/99076916925.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=comment+avoir+la+nouvelle+version+d+android
    • 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_off0000bb8c.bin
73406cd185b4f1c26f9654e589d66cf0c98cfa6431bcdc8b497d9666b8ca3c42
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8C 16544 bytes
font_01_sfnt_off0000e4f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 16792 bytes
font_02_sfnt_off0000fd0c.bin
3a17ecf457228e1bf52cf43fb893bcf1d2bcb844c33e0919acc346d62f1a1e12
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10608 bytes