Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ad42901319a035…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 10:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99038cb7eba5c540881ee3de75f88b77 SHA-1: 8b0bc089e6481c38ed9e7fa40631deb44095d597 SHA-256: d9ad42901319a03543a04640c8d8d68c5c52cedf1eb7f2a6b2e01c77eb2147c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection or execution of further malicious content. The presence of numerous URLs, many on disposable hosting or pointing to compromised CMS uploads, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brandorbit.in/userfiles/file/36213945311.pdf In PDF document text
    • https://85097781.com/upload/files/lududovovobinupan.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1e6a56c4---21011620581.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5563bd1a16---puzutuminozepewaxot.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/vemevanofebejiluno.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/fotosux.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xazuziz.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/28492273477.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/v9sg5s8lgnpe87hcnpef85lclc/mupofufap.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/ruvusisapikuno.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/44093825242.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/manusaxiweloba.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109062129482066.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/rivivumunitamikaredusobo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4961080f---vazokose.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/mulufinejofadefeveve.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/8830179496.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zilavagu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a198515e8cd---23214651772.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/zisinuse.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/nozazexumalojimazuxi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/54334273487.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/segixumipomo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/51099948284.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa1884e6ed---rigawipibinazikakoxodaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+editor+free+sejdaPDF 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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 10328 bytes
SHA-256: 74556352aaf125448029e0f47a902b40c979e25f979526fd14e4c1b48d2c4734
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 18420 bytes
SHA-256: 4d8aaf79389c4d7512537b8a8f49d87817ddaa2a230bd1e39293be379dd5c014
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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