Malicious PDF — malware analysis report

Static analysis result for SHA-256 f281557711fb258e…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 10:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21ca65787ebb26d86ed14794ddf26b8a SHA-1: cd3659a7a8f2c35f4e94f4df67e2632df40458fd SHA-256: f281557711fb258e2e90f4de3acfbbf982c90328a18140d75fa833f498b7fa4c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.centralperdana.com/file/negumijibirinu.pdf In PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/rasadamidoduton.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbdbed691---62744407824.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/5188651293.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/34424649844.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/dariw.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/6396864915.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/xewume.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071540312af1---95270203091.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/67458128217.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/55963113221.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccf4f97d74---12118590871.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f93271bf2689c745f096675b424d71ff/34906031257.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/buvugoworavuxatemoxenejig.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/lejobufuluzasemi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3cd2598a---pidifebitezedobipevu.pdfIn PDF document text
    • http://goref.ru/files/file/fifiw.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/62157127577.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/suzud.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052503172273499.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sisifubexemetuve.pdfIn PDF document text
    • http://synhbio.com/upload/files/zikuwazinasu.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/wefida.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/wadepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=when+citing+an+article+in+an+essay+do+you+italicizePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/615e8c62feb5dbafe72c9b78f287caa7/wojejaposew.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_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 18724 bytes
SHA-256: 8364316dc4075a0ce45533cd995c7bee8f15040f7aa6db9a4097dd41280d4c93
font_01_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001446c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446C 10916 bytes
SHA-256: a8b0ab2e0bd8007d7655edebfbc4a1ce66b9908686f80efe39d7c084b0bddbbc

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