Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ade601b7042ff22…

MALICIOUS

PDF

87.8 KB Created: 2021-07-17 04:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a6316f888cd0d9498c6af12b34ee944 SHA-1: 4622b52833a6770274421012013eb7870e390d81 SHA-256: 8ade601b7042ff2219e7c4f0f3a5e0ca4bddcf8432d1a25d40ee74edc246c308
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://aihr-iadh.org/uploads/FCK_files/file/molod.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0c339d7792d0fa6f083de9dd3096c29c/zebofixuradiwut.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/592201c0bf3d3a396e69a733da131b16/27715430406.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/libelenikobokabuj.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4u9j8eam8d01uc99mo0ffen49c/gujulepexupidutexexikato.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/16970527122.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/2554494603.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/xuvalabetap.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/17587568506.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/181d423324e9e4b0d4ee9290a0e5c724/30256596965.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/786da349967108563fdabad91ac0ad03/duriginakapamedi.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/93071323766.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16083d81e2e23f---zugojizawiwilobe.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/wusifalavobilolixar.pdfIn PDF document text
    • http://keacg.com/upload/files/tadesejimus.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kamuxes.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e1uecelhhl027mpt5v2ic70gq0/92046135560.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210505231058497554gma0z4.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160862012985cd---meguladoxefo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de1a9213016---67421337150.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d8717403484cbf896127acd7076fede1/movejufamudomigizanexes.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/57796707203.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6c62db2359e6d0c90b9047164649a8b/xofebuxapesozanomem.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/podirebabonumojejupujusen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=weaknesses+in+interview+answersPDF 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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10172 bytes
SHA-256: f6438269f5611ccafa1a103bfdeab4b9c2af547194e4619194f81e0d605b9d1a
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 17444 bytes
SHA-256: 3e1a8864a5315696b1a4105f0feda8ecba4eef21ed8baa6f9996705f8db534f8
font_02_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1