Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8fc38a62aebce…

MALICIOUS

PDF

97.7 KB Created: 2021-06-26 22:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 006e660ef25e1692163380c59a3731f9 SHA-1: 19fee84eba445e921e1d8732a773a66563652f1c SHA-256: 50a8fc38a62aebce0bd8a47faae7817a229544285f505417166626edb883f444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress sites or disposable domains. The PDF's structure and embedded links suggest an attempt to obfuscate the true destination and potentially distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://ipceurope.eu/assets/file/99005609772.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cac8c829---widamupadibi.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/50599563168.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gscjknrgim8pl1m46sog6c41g9/33716395630.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079063dda841---mekakupuxixefuvoto.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1724caab7---17883096022.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/3ba8d1722fa5ddfe7517cac26fdc6f7f/wegaxomanuwupefafibipi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b956d79f0c---ranude.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0c7d75e7---21852174444.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/gisobub.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3f002d0f4823272a5e8b55ed917c32ae/26447238188.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160817b260c0ff---dejorezorowalowaxepurupil.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5652f4e---nageg.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/laponivodibusared.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dkbmp6nvsl79ovbk255fedehe0/91194426264.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/tafokufunazifibejov.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfb763d39---tirevajidiz.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/getugus.pdfIn PDF document text
    • https://alutat.com/data/file/jeredetolikivaru.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8bfbe4209a7974ca1977b8e7c6d056e1/vuxedoxasuk.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/c7f6903447855edc86931fb0c01bddb3/nosatunososudej.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/64030996974.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d84168bbf---48981976536.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0bf8e235ace8618d481f1dac89328b66/botesipepupinemexe.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a631124807821a7e9c4c9aa63cef5371/mimusuwepaxexavusex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bruce+lee+birth+of+the+dragonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 10880 bytes
SHA-256: 5b439011be1b9d007c430bd50d98bb4a26f7ee2ebb5279242df2b7344b8e9a34
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 18120 bytes
SHA-256: cd46c2170997e9cf868f451372025d9c55f8e21c5d207ee88c0bcf53a6856836
font_03_sfnt_off000160cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CD 7344 bytes
SHA-256: 333b1cbf7a7e01a4743836157c56507c6063ae2573258757717af82758eb60e0

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