Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad63776dfc1ecb5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 11:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 059783a1f3b43a9aadc9ad2a019fbbd4 SHA-1: 0be93638a128acdcda38837856713f1fd0355864 SHA-256: 3ad63776dfc1ecb54e94c03b47da936f6f7b2c9ca6bac1a50220dec24b23fcdf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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://philabc.ru/uplcv?utm_term=instructions+not+included+full+movie+free+download PDF link annotation
    • http://bagumul.com/file_upload/spaw_upload/file/20210613205517.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1220e5b695968dc604858bb87cd3955d/4217670060.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8ce1362c20cb3311ffc1809aa31bf246/nezupuge.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/sesapevufinoj.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d98a1c32a38---19997153672.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/tuvopelekekalakopanup.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/dilaremorajiv.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c64eab7fa2fce566e0bf1d68a84bfc5/rifirukifovarewusev.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9844db499e---paduwosaladutarufonuw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f84bee866---kiwifo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/rapiro.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000b9146d5---kuxefadakif.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160babdaed8923---12247081591.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/33e7a994b373216df591e95578d73742/suxofo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gar3mq6ug010e3mq3af8vtgfk4/kekasifazuruxujesa.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fm6cvjnp114ov2c9rru15mun05/22302369767.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/30375148911.pdfIn PDF document text
    • https://wecareprogram.org/images/file/39951469948.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/pokukenujazanusojixikixi.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/61536279686.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d719a53aef---tanifofajuro.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d35a712e9---vunamokaduwigulo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eaf686cf46d055b1b289359c73810348/pezowasakosozusa.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/dgced2ujdngfatoaq8rra0qu2b/48116813483.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912bb16510e---43551748535.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/rivonumumanelak.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/96289151435.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
stream_003_off0001054e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1054E 17352 bytes
SHA-256: 86f3d2273444823e1f5e12fd99eddc63aebc4940f767b1d68bcc3d7932a7193a
font_00_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 10840 bytes
SHA-256: 777fa0304e20dfe1ed142048efbe4ca880370d05e72f143e2ee7b9dd7efe1ea3

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