Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718ada9d5d1e8af…

MALICIOUS

PDF

96.1 KB Created: 2021-07-03 21:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 192d6e21747f7c21b4827c623901cff3 SHA-1: e0547b5c01bc895a04e7c64a4bfac77f821f39fa SHA-256: 4718ada9d5d1e8af613b51604c9aaf73fcd2f80c3bb2bbd43491b76c46f377ed
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing and trojan delivery scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hospvetcentral.pt/site/upload/file/bakegaritesezuzowet.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/08fab33ff32e81e15ed759e080a8a0fe/xozitapumajimadejoxi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d791bc465c4---mezodenofikemudixefa.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/da0975842e8b6d94e0e651ba4e41eed9/38669233829.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88108563311.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/webirofufo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6e661c0f---93275576049.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/dowonisivuwiguju.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/midilapigibabaxa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608590107e96b---gazudawunobomorutosa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3adc019b---lijeximadepefavosabit.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070804816a82---33101924865.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kokiferobalanejetijowase.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/3202410138.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607372092641e---pidezodi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c940c558---lefuritarapalidogokepuz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b6c7180b---mavuwexeko.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/degovibapubuxakulude.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/tixedupaw.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/88430054207.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf6af19a89---gawaturetonukukuzituzuk.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4aedf4dc862187bb97f062dcec710d39/wodisajitu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zupufufikapapi.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/favatonurulupenenuvoril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+witches+2020+full+movie+online+freePDF 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_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 18408 bytes
SHA-256: 68bfd2f89bf85247f3d90fc0716a05da98183a8c7a8a0628cb566240d8289cc2
font_01_sfnt_off00012b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 10896 bytes
SHA-256: fa8e0dab0b8205cade54e3f7771eab21a64eab2f257e6ca20b6ffe84ab9eacb5
font_02_sfnt_off00014456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14456 16248 bytes
SHA-256: ffca1bb38f0d2415baf55adab0e36d0c568b61ee82eac793405a9c8e729e57fa
font_03_sfnt_off00015a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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