Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9ea2d6f90d91f0…

MALICIOUS

PDF

103.1 KB Created: 2021-09-06 23:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6afcf72f811679aaf737e98573755209 SHA-1: 5f771f747dd679dcc2f75a28380253530c0f9cb5 SHA-256: 9c9ea2d6f90d91f0ae61b90c9627b0b906d09217fc3000a9c9d38259ff4472b9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the nature of the links and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/25717c7466383f9a302340d81caa254b/97033973003.pdf In PDF document text
    • https://stormester.no/files/file/suboju.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215101859504680.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/dafewanomurixifatarezoma.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7eab845d5203a0f3911753a230aa855d/66632966469.pdfIn PDF document text
    • http://grimastone.ru/files/30636222233.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087239f41cd1---33466647845.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/43842509187.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/746a19574b4380ea8458ad1405cb538c/misulivuraga.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106b94b16e---bevaraxosexi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a520f5eb35---retafezela.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/43841366340.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8pvvjh4s6cjrjk0ggjf63u8jef/fiwixijaweroxewuxizida.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/6815136072.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/94703623de631ef6ec476775f83afb91/80456198356.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bivavulazelibal.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/ziledimoxumi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e224b6bc7---pevesajinawodezojawexijom.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6246a7b3---kazodidafefolepifip.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/11877322485.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1806e0c67e1a998ec80c33c1b59dff08/46416988232.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8fc306dc0---24833842215.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948e56345d1---rapikadibegefojuvazowav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manually+update+windows+10+buildPDF 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_off00012d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 18496 bytes
SHA-256: 83554be9bbab13eb6e6ca8f4dfe8b170f9c0cecea0ce05fec6b213862deadaf3
font_01_sfnt_off00015d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17566 10892 bytes
SHA-256: 70ef085af0a966224d51a450b52947c28e0b598159dfb95dee94beedc0d8e202

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