Malicious PDF — malware analysis report

Static analysis result for SHA-256 f085278049ceb2a3…

MALICIOUS

PDF

92.6 KB Created: 2021-07-22 19:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eaa1736fdb61d6f03fafb67439f5d13 SHA-1: 49d2909bc2bc17379a74f3d8d5012f0c47e8b3a0 SHA-256: f085278049ceb2a366a6d9fd7fd9e9020d8573dc1175152794edd8fcbbd8998a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to redirect users to malicious sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs, such as downloading further payloads or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://banghetretunhien.com/media/ftp/file/dikagulefomagilo.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/najewagumevajelijomuwoka.pdf
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdf
    • https://ratco-hardware.com/Ups/files/jilisewigokarifizetigejig.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/fizarofutilenoj.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160855a0faab8f---radow.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f63eb97240592a9b85f3958b823532ef/61011146398.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ced2bcf063e---toxevubeguropopijowusowu.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a2728b8c---62784935009.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2adbb82245---25116740396.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/da8f03bf28d800b9ffd781ff9b76864d/19669514868.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2bi00fkkfu2pisthm3gqim56b4/dabazatisukirixokul.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210630_DAA67DBA2D3DE1A5.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160caec9ae9747---gawokanijivuragano.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/sokojejiwakora.pdf
    • http://harryreichert.de/uploaded_pics/News/file/66236201760.pdf
    • https://olgunbey.com/upload/ckfinder/files/gadudixugoge.pdf
    • https://businessservicesuk.com/userfiles/file/joxirelewuger.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160876acf3519f---68256510517.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/617b22a7968bd694f7d2f6c62359e3b8/zuzivawafarezevotave.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/39769404911.pdf
    • https://pasarangroup2.com/contents//files/55850018667.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vh3ubmpvf78on25oh973a1c3n8/rusotipemisujubojezasa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=driving+in+gibraltar
    • 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_off00010795.bin
89a5daff8d9ebb593f1ddff089afc574f0d68e303eb168b6f9d98f10a22fd0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 17792 bytes
font_01_sfnt_off0001353a.bin
6a1f3229458005ea876fee0ca3ce829e23e6eb787e1a451fd4934c4b5615d20d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 10072 bytes
font_02_sfnt_off00014bc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC6 16792 bytes