Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0a36310065afd4…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 00:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ea6a70e659fdeb6c475cf2719277409 SHA-1: f3b366be2585ca04b81869d1b31d8676ec7a6eca SHA-256: 1b0a36310065afd4f2a22bedab5b7948f4adfe67ef85b348547c0714707e5def
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure to trick users into installing a browser extension or update. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=active+learning+template+system+disorder PDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6b1924a19cf62de8c59e35b13ace169e/riderasibavepeta.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cfe4d33dc44661032e76ce6f9867b1fd/ratafereno.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5479ab2694---dinekobe.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/difonokaxa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8tdkmv1b0jln3upjb01e2dc356/95496333579.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a0e5747cf9941a25fbb85df27f9d7940/wifopakudegokategufi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/8sovkbpkf4d7ujgu3rl2vjlvct/vokigitat.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/lofikigamabeg.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3484556e---kesopubamezekepajimeza.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/nitedoverijeroz.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d39ba3fb0---95248645952.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/65195479262.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/53497787580.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/danefadulumevipi.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/resuxujefuwog.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/15413597138.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vkkecfa1tlahu4dvf0vi1a16n0/gelibuvivapepawesamaluri.pdfIn PDF document text
    • https://soechi.com/userfiles/file/38189477518.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5a8e4988549694b83a72f5ccc781e571/muvirusenazuselagipilu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rukomuxakuw.pdfIn PDF document text
    • http://pololanna.com/user_img/files/dikegadakipurifuzuporifa.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/79428748743.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae07b2bf573---gidevimoxatamu.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tifosusut.pdfIn PDF document text
    • 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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 17928 bytes
SHA-256: 5fab1e04033f3ce909a41f25c080cecb8dd6bf2f07c535a54f86e05fe8788798
font_01_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 11016 bytes
SHA-256: 52e94da83ea24e67a56d88fe893651ee783521259009ad7f8ffb6a9a432884d6
font_02_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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