Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdab145370253ce6…

MALICIOUS

PDF

93.2 KB Created: 2021-07-26 03:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88aa4d3d72fe3de328be02d2b1b96bb2 SHA-1: 22b405ce1b6d9b27bd4bbb09c712ab08d29ceccd SHA-256: cdab145370253ce6b92e43c8360f6b9debbb29f05f67b810f082f8e30160c90c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/304f6117211414162349e28f3f70ace1/30123836112.pdf In PDF document text
    • http://goref.ru/files/file/vupub.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3a3de9182bbc847d50e8e827cdf52a4a/92569060546.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/931b59739e3105d87655c6ee80de931a/kamofi.pdfIn PDF document text
    • http://bociany.sk/media/file/turofoxefakasimorabefuxot.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9mvmkmajc165p4ap484tqgrks61456pa/28444647056.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/wazozu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdeab034b2---tovijowamisediku.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/34795658619.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/rejuwulevunuduf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca75a197da---nizafesemizowewugodusaf.pdfIn PDF document text
    • https://aedwea.com/upload/foto/25989742074.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e02f235f---xejev.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3978196924---bodirodiwoxebitula.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/34643510378.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8973adf6c061c58d1ba819fbe5cba3ab/52045349234.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/purunuz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe86932159---vabitedegufija.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdfdd2db1---mesopeniwitog.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bed05f742a7---mexasoxibomuji.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081496ad26d6---82279866839.pdfIn PDF document text
    • http://abwessex.com/uploads/files/jumonusexek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=planeaciones+para+2+preescolarPDF 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_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 18776 bytes
SHA-256: ea55dcb7a12442f8dfec7b4f5940abfe88b4b975070c9818eef0cd85d9becfc3
font_01_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 10392 bytes
SHA-256: 9c3d7efb1902d817737412a0c001dad3a8031ca532325a297a92406cca2efee9
font_02_sfnt_off00014f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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