Malicious PDF — malware analysis report

Static analysis result for SHA-256 561edcd3e2a6b997…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 17:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1cbf773589176e7f782cb92f41a5815 SHA-1: 6ca83ca787e489de90dffcf568c2cff0b5dd5671 SHA-256: 561edcd3e2a6b99781533c53dfb88fc825127b0763b97da9658fbd5d19df6c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms on compromised CMS uploads supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=woof+and+wag PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3b989a8b18836cee652e01703fcbf3d1/tonaxodibuvadomevaduxugit.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9e2e5007---7152365146.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/dixagigenexeripivajasulag.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e3862137---rofajabizir.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe11f991ef---17080224922.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/8uulesc872dkrpegsillc8tbk4/juvelodimovo.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210603_57916BBCCF4A3A77.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608310aea331a---suwitepamejorobutos.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e300b5fc697ba25a1031cd8e5a0ee492/nenuredakerugiwadijuto.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6af79b8fb---jakuxomosuboliwalerezuri.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54bad71030d5f98fcb9057db620c716c/wimikefojelurudufejov.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/40061297118.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/65727531230.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d9f20f65---64662648690.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/gigalerireza.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2f5ae3f6acd4f7987ab4426f7d631609/serokagoxazuvamagefobemo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957426f25ee---98297516450.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rejudebobonizaped.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e75971a9---63259323809.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/80931777172.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c25233a---vimenedozelobe.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/netuxufemilubosemuvevip.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160814e5c4c3b1---18759234757.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/778117e7b2f399d9b4d2f04e87678aa9/29641298064.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_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 9972 bytes
SHA-256: 38e0efc4071b94983576e7ef13e102483f9ccce49a49282dad41533b5a17b037
font_01_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 17844 bytes
SHA-256: 3c190dbb04182a71b210130ba8e2673cb82d4adbe33a404a4fa637950a56677d
font_02_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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