Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa71f98b61b38b85…

MALICIOUS

PDF

101.2 KB Created: 2021-07-08 10:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9d5c16f1a754ff1625a1e47bfe31803 SHA-1: 552e25c62b5c5e4cf1dfaaef6ecef58dcddf7c11 SHA-256: aa71f98b61b38b85931cc7326007da56daada2144ab1f60f2d1b3eb3c2708b22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9253

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 https://paklya.su/design/img/upload/file/35510465873.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ae5280df72c1df4f047494f7bb2c1bf1/10108302617.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a86c91c75---65031138396.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5955e26c63---20235897650.pdf
    • http://gillsandgeckos.com/userfiles/file/85716229157.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d6a599c0b408a34ea13c94f76dab1e3b/15126918927.pdf
    • https://noblacklist.pro/web/img/podborky/files/964010783.pdf
    • http://kiemtoanhaiphong.vn/upload/files/442922384.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/631ef10e6f92334b75ac660e7804d0d1/guzekidarorejovep.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xegurefojefebalibuxex.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dbqhpkn1i3rmelne9crvagmfk0/jijopuzabisepunetewuz.pdf
    • http://www.thaiboat.net/image/upload/File/jejikiwekaxovek.pdf
    • http://arci-mp.fr/admin/File/piwevubuko.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/dowotepalefosofolapibefof.pdf
    • http://accessiblevehicleservices.com/userfiles/file/57435367942.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608229c780b4d---55211674248.pdf
    • https://abeess.com/userfiles/file/lanuv.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/xupinuzexerinipixa.pdf
    • http://yuemeism.com/uploadfiles/files/nokogewagotidixin.pdf
    • https://hbphoto.ca/resimler/files/19407845462.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096519d9bbf8---peduba.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/62081465226.pdf
    • http://europavloeren.nl/siteimages/file/30387922068.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/razokozafuzobaviwarusoz.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a279ce4a---gozixijebawawo.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67021006c---90686300952.pdf
    • http://nextgenship.net/upload/file/20210610162334873198.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af277cc20---sefoxigoxuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+most+beautiful+moment+in+life+part+2+tracklist
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
font_01_sfnt_off00011890.bin
51bef605a05648560eeb9afbbb5d258346af193605d18f474f882052ab5bb7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 19320 bytes
font_02_sfnt_off000148af.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148AF 16092 bytes
font_03_sfnt_off00015deb.bin
2ff2f51e5829d8600ed950edf35d19d7a0d198d6ceb35986264b8bc041bb9347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEB 3508 bytes
font_04_sfnt_off00016c10.bin
afa2ace03d91c09d272681e7237760b08659e3c3bce10fdc86f279af6152e077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C10 11160 bytes

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