Malicious PDF — malware analysis report

Static analysis result for SHA-256 683be296025d532d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-13 18:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50b56fc875f494ccbdbb7cd5a4e53e5f SHA-1: d5f4057236e5926ac789d8cbcf9bc2980b9b2dc3 SHA-256: 683be296025d532d66ab28cba50ee8456914eda46295c05f60b9bbf35b5958bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS uploads, suggesting a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://cructi.ru/uplcv?utm_term=how+to+find+adobe+acrobat+xi+serial+number PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c14a16c2899093724f46c742f5930926/befoborexitewakozenezazaw.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/palulafaxotewe.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5c7cef2eb6dce1cde5c21119d7d83219/13484846115.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/nenumawujomobumobo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q42vbiuvkenoqbg145bdkgu1v7/belupoworuguziw.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/resoguvekirogutimumusopo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/lilefafazakug.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1ca3b05615dabf734f5e2e007daad963/regakimejubulirolotugawo.pdfIn PDF document text
    • https://andrejc.si/files/file/48107179361.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/68258145823.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/webifunapale.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1553fed9966c1b86eaf1933c4f39a005/63853078342.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/kufazakizakobat.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/02e9ee7dea71a1fdb98a6b718a5589d4/tonexuregizesisulenixa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3f74639d---rusuzopaxufipep.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/16d5a63j5526rgvb4rbgu2ljpt/86963145796.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa70048ea---depupuzonagomori.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9a7cc7e7---nukizibebusorututidotutub.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae017d2f3---gezerepiwomivosazub.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf0b5990c---kalopidanedaber.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/30784755608.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/40226238974.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/navoxivezax.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_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16676 bytes
SHA-256: 2a7a4e62aee09fbb6613b77d74f55f2f4854823049bcf48092f2feb436052acd
font_01_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 11056 bytes
SHA-256: 6317841aaac1162adb1bf5095368be0105a8ccc88279da347b74adc729c3b5ab

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