Malicious PDF — malware analysis report

Static analysis result for SHA-256 4605ce9c48970721…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 21:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 31c0f8e92811e66bf0de900a756d7ee1 SHA-1: 1329fe7783fae63391ab9caeb518f1839a662a27 SHA-256: 4605ce9c48970721ceea84d1d123c098e1b23c643567da5066f5ebee39bb3397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=high+town+series+review PDF link annotation
    • http://ajivikafinance.com/userfiles/file/lulavibu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f7747534e067b65e5fc11920b04e6118/juwepotosixuvinexo.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/vezunanikobeximoliv.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70128126c---zumojijonubesejavikakino.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ce2bc1d19f43cab78a2e003a3852842b/savejabemevunagenomer.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4dea990b---kegurozekejod.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867c125fc5---zipigetukumut.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/nutif.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jl6n8742mub6baul13d0h8p34o/rofobuzujemenezap.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/87957676944.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65be0cb50---kusim.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050217065317.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/94704280619.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/nixizugato1624675690.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ecc89a930---jigoponagusezebuzebapebi.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/tabasaba.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb45a4cbe8---2292633549.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb24e45601---nuxusa.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/dijujoxupatirizojuzoviz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a8b946df---zuxutojazid.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tunudo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b60ef72cf65c7caffc15b1ad0161e844/viwajoputuzuporekusupogo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9e04a64b9b133cdb4a4d565652da0f72/91922954122.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/er2klg8errh690c3ka2iuug3k8/jeporajowusuk.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_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 17720 bytes
SHA-256: c1cf9a243db03eaa77959f2cb5c8e2c59a9470ef8d2ae4f6f57b2c04f45529c3
font_01_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001478f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478F 10324 bytes
SHA-256: 6e77249a8539f93a67312724177e4d7027cf999239f7a1509f5fefa590888f9f