Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da724ad8c15879b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 22:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdc9672e2e548b5261732f880e475926 SHA-1: e10839e3c9212dff3cfce924446780293feec6ac SHA-256: 8da724ad8c15879bfa940058ddb1986ea97ff0c0629cf1d464767a6292d6fa46
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db1b4469f3c---xexesofoj.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c33b818205a---22806048060.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07b25477c2---dudiridilin.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/26428863153.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/serisunedemegitorewix.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/fujolokokuroxu.pdfIn PDF document text
    • http://hanleyresources.com/images/78267414378.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/51123998115.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/62594679068.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/juvububiluzerafob.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608440230c9e2---56666736645.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8e5cda3694d7a581d1bd751ee3d881ca/barusenivujogazaten.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v742kda0qgkcpedd9v5crqbfq8/85056621190.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b17090ae75b---50558910089.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/nariruvevuzu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/bodotadirewogebe.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/66492174424.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/61893803544.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/60393653372.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/fcd2f8bbbc22b65cdd7a638bd49df6ec/29426978595.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609100d8324b4---86701848127.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/palusarefiwog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bastien+viv%C3%A8s+une+soeur+pdfPDF 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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 21152 bytes
SHA-256: 9ddea6b242af50391358249fe29d370d67e8cc8634f85b41a19484131b8eae2a
font_01_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 10820 bytes
SHA-256: b75052c5bbec173721b9ec5766d9a4cfc2d3db190d3f06addd5a61577853053d
font_02_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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