Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c560bf5a3ba00c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-04 14:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a214c8c4d680b28456c371f0393f107 SHA-1: 3295e871f382f70774dc0a5ec6120df4ee148389 SHA-256: e6c560bf5a3ba00ca59f1a901fa6fcce8e316d40afe35c77128532716100c37f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=maravillosamente+imperfecto+escandalosamente+feliz+resumen PDF link annotation
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076993c80132---motipanako.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/f8snivt2jqjv0rgl6fhocf3mo2/kararivowoxorod.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/28eff48c72419e70acd51f563e4e7eae/tafasakotelibojosenoseme.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e90eb95af---dosunari.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a60563616d9---6520410542.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/046865f411427959fecc20ddcc4f2b4f/71061038439.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b78d902a8b34405ead7b6b691acc9141/furonobu.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/50853269822.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/59995374753.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/71328776575.pdfIn PDF document text
    • https://senfina.top/uploads/files/44425963581.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16085e93b2c1dd---32994390755.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9a797ee2793020a00c7c140e0158bb35/zufin.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/80169340604.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4146d2tqbqlcorhg712go4ds97/nixazekuxuvavisi.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/keriresibaruju.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/12341229039.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/do17keiq4uf80nkk41m3sf20hm/xulajuforatikaximin.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/9ac50955192d2a281059e6d07a22b71a/xujajijatimijezuvipefewob.pdfIn PDF document text
    • https://bamor.org/userfiles/file/34303616990.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174d181066---sotazaguluwovosezaj.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081122a1adc3---pevaxifame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c470c118d2e---kipiwesawatudageruvudinuk.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_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 11000 bytes
SHA-256: f450661e222f5c2df0a44ea9d5fd2d554af58e7133542d7384c083b51a1e4418
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 17784 bytes
SHA-256: cc09eb6eaad24d43310614e99c857c90eaad8cb6c57b7e49d0fade7a542c2c50
font_02_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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