Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a610b380d196f95…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 02:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca9f4bce7a541fde4ad40d69b0d042eb SHA-1: 0b96e23fb80190c5375b29afbabab5a7e5a4466c SHA-256: 5a610b380d196f95bab7d5d3b4d67055f86ba20b658e19b2ce3d7466a475b459
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs hosted on potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u1ibj42br2ush15osaoiaok9a4/97103930107.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/97f592d69a6fa42491bd60d87d2973b3/ranazozed.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/lubirowanikepavasoxari.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/satogubid.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/i933f1tvcifaoiqkd9k0hrt003/95924159862.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2ec735e8c7065a57c597248a96f85a10/losifaser.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/314dec85494a016d8f05605b6c4f9d24/juzogib.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/29193f6cafaa3cfe8dc871a25bc297ec/89057244174.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/tixeritigabivotunenetinaw.pdfIn PDF document text
    • https://alutat.com/data/file/67566231563.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/pikujor.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803436a9d21---28357244816.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/maradikenubakojokaw.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1fcddc4c1b3343ecd92e7e2852e23cbd/wotatujadi.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/nafewovunetok.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/sudibifesibapevataw.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/repanoves.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/bofazetemilizasamupo.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/zifeniruxu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/pexedovofelumaxur.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fnlvet15ngn4rp6i4gcrrjspvn/65888474323.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66465812050.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783a6123472---zolanefove.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe83d83c1---lesuv.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/zinebozofebomuzofu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8e45950d---zalomaweputafivupejusix.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baafbb67bbb---jaziwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tn+govt+holidays+2019+pdfPDF link annotation
    • 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_off0000b5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FE 11148 bytes
SHA-256: 0d4c41261f2f2142f1d324cc029cdef82c3f23520eef38632f34feb273a70668
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 14660 bytes
SHA-256: 7daba1b389231b094a3bda8c014160093d85ed25c8937c1e4f4b5bf04c29d0cb
font_02_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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