Malicious PDF — malware analysis report

Static analysis result for SHA-256 252addaa6d5f4c1a…

MALICIOUS

PDF

145.9 KB Created: 2021-07-18 06:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fb309d91c059e6a3cc89eb03acb7c85 SHA-1: 1fbf3e1567cf3958c0966cc09a3689961d022895 SHA-256: 252addaa6d5f4c1a68bc0779ca3ff8f6d99639ef18cc06a0be72660dec35edea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 6

  • 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.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1d4nvvobhob7v6h346uflim2ou/28250614430.pdf In PDF document text
    • https://anmoul.com/userfiles/file/92548543857.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/giguzagutetijew.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/faxotulujumudinokelum.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/xijijarudifil.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/64947407487.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a30d8630d---92296561307.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4322dc390a41377488c5a1ebf7d179ae/57223568233.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef38a50aa---89755874229.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8c7e8e61---69957719079.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/rawafuput.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/71639052548.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210528170135669.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/31984209922.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/98011398217.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b186957ea---83645454831.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a451c421a88---fitidom.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/87752860942.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2be1c7a60---vizogopu.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/70980675444.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa107c9e87---notesudu.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e85cdee75---74093549475.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/dedamodibodibedoli.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7b68c9baac791476a98596abbab330e4/45956207226.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/70339495865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=his+greatness+is+unsearchablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C5 19344 bytes
SHA-256: 8ac8f5e2f61859ffc02abeed64bb9173e67b7b8b65c0e47cf6f4ad42e9eb2f06
font_01_sfnt_off0001d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6BE 20476 bytes
SHA-256: 536f783a6fc4448a8374c1b1cd4430eeea24b3ea296ceaa169f5f7d6b17fb69b
font_02_sfnt_off00020914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20914 10620 bytes
SHA-256: 843968d7ef74fd6f5c51c154bbda62a334d8d1907c2c0a2736486c6213a976f5
font_03_sfnt_off00022141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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