Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3b3cea7f9bdb0e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 21:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8010167ca3cd7733066e799bd11b21cf SHA-1: 8f90983fb44deadbdf9feb7337854bb7bf03dfa7 SHA-256: cf3b3cea7f9bdb0ebd937d1a70c837f7f5b8196af1351820be9807b592f4ef46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=theories+of+social+learning+pdf PDF link annotation
    • http://capesociety.ca/uploads/files/65429635584.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210530_180801.pdfIn PDF document text
    • http://rilta.net/userfiles/files/79119217409.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/mazimusubudod.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/12486896397.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e0f4fd3131566a8e96dedcb271f71a4c/42498717448.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/106430125560f5251ac424f.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/627d4a8741c3d60c3c410174926eb312/ramukesarejalij.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5edca4f746da3a974ea22ae5ae18b439/bapaxiped.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6921079306f98366bea2b8428d653c64/femowulonesebawafu.pdfIn PDF document text
    • http://podushka.by/files/files/45210063915.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/olepfpu7l3p1krmlp5q6epn057/bodaxisifokimogor.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/15887189806.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7cca1173---12119340997.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a76adb3b7e5---76244485347.pdfIn PDF document text
    • https://samowar.ch/upload/file/wotulodotimavupili.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609048faa1ea7---zekirufejoli.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/71711439879.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/bakizikumotofuresa.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f9aeb340fbeeb8abcc2df3d313662a1d/vofazurukafexejazodosuvat.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd298e10fe---kowulipabarolugovelejom.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/kosodulunuxi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e315db99f28---92661659544.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656bead869---riregifuk.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3a21d0d1e51478945d7c9b8017a710d5/zopijaguson.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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 16960 bytes
SHA-256: d4bc460a11fd4d7e21f84415ce6cb5853802b3fad014069e5d3739296cd10fb8
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 10764 bytes
SHA-256: 22af1e2f50717346025fa94a3816e3f2522c8b9880e67733dcf19c1ddcf5aa1a

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