Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3e3f7f3ab4db8a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 08:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6484c482a4aadb19bb1be2d2b9a5dffa SHA-1: a05e4e8459849c08f991278db5448bf55eccd23d SHA-256: da3e3f7f3ab4db8aceb4d9f7744914562ec23ef2b6688b9f2f5cf7046710c6f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=singer+featherweight+100+owners+manual PDF link annotation
    • https://lesfeesdelhetre.fr/upload/files/dakapexam.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5ec196256---jekawuxudovuzax.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/19033622587.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wutonawopinelizeri.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a661983e554---suwaje.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/wepirofa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c9ccc0563a---86482485746.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/borije.pdfIn PDF document text
    • https://landi-bg.com/images/file/91193767652.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/wokavekagijuwaluno.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/bimop.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/53999393276.pdfIn PDF document text
    • http://rld-carbon.ru/file/60222366969.pdfIn PDF document text
    • http://lachina.cn/upload/file/fetaro.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/830422d9e59efed509193c3009909b06/35056722309.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0ae37a983---90140965320.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-25-07-59-25-11.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/44264602986.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d61a7e1965---74381098197.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/zazamoluwifamelek.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/47222154908.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/s65h1qjteaqdkhd7k667p4443e/79332298080.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_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 18672 bytes
SHA-256: 1d0ee49a12b7319638b96f7f4f16b7fdac4e2e858ba1be0ae3e924b593acf9fb
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 11096 bytes
SHA-256: 5d7db4b2bbff7a10fcd812e012ff15fe8b8678448ae86f424c842819a84078fe
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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