Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3fcdef6cdbb02e…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 18:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fec4d1b12c12455ba6b00f6fae006ca0 SHA-1: db98cd22b4c85c2b214b679dee9ff32561d42992 SHA-256: dc3fcdef6cdbb02e134b6ef854cd5fb4884747bba370a968d583747285d70dd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or tracking campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=sitting+dumbbell+curls
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1a34ae97b---potejofogijemus.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607627f3c6a2e---80171972761.pdf
    • https://advantagelic.com/singhania/downloads/file/64703446192.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609391bcbb4cd---1960447606.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/87464265293.pdf
    • https://villatoscana-pi.it/userfiles/file/39850726204.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h2m15g7e88hjq0c7tj5h7db7g6/nanesufatuzevu.pdf
    • http://smn68.com/clients/75339/File/55101009298.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rgvemmpmk0mnnsciifgklpgbha/55280544906.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff0b59912---20620204238.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4261e8d6b946e5500c94d2b8d812212e/vogixixasikojozitil.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4af34fb97---fowabivupoxo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085c742bc2a2---dudedidebowumo.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80d80ed01---dunukoxedolelezu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160766771a34b4---13873234557.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc11f047f---56306094775.pdf
    • https://ikitellirezistans.com/upload/files/99798501923.pdf
    • https://bataretak.com/img/files/file/81888267931.pdf
    • http://glotecgh.com/upload/editor/file/fibubusasa.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q4tam9l9avp74n5h22is219bu5/28617588099.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa160d8b63---52268549797.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096980a86c7a---47960877067.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2796557b4---83322825973.pdf
    • https://lemanssrl.it/file/tabudi.pdf
    • https://bamfieldrental.com/userfiles/file/mamavezudisexofujosit.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160819ab3e5c08---41961225272.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/86514857294.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formc
    • 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_off0000ecf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16792 bytes
font_01_sfnt_off00010509.bin
29b16448e95dd087185696cc2d0c4943859f3f624dad2b9d61ccae6f101c63da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16928 bytes
font_02_sfnt_off00013111.bin
21697ea7778f1ee815deb0e6edbd99b2907219bc34c27b8ad608a028fa7e7708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 10748 bytes

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