Malicious PDF — malware analysis report

Static analysis result for SHA-256 83de6a743e4093e1…

MALICIOUS

PDF

93.5 KB Created: 2021-08-12 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 437112d9228a88bad9eb3dbab5f9df4b SHA-1: d7bcda2d287a6309715816d71e4950895415c14d SHA-256: 83de6a743e4093e18c128e35a28ffa00f7f9e99672fbb37f105c35b1866aa647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pixomot.ru/uplcv?utm_term=how+do+i+calibrate+a+taylor+digital+scale PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1jpc1f61ltlseofdin2cpm2854/xoribiv.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e659ab52aa---95389400941.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/7429971343.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eecb1bab7---83916056935.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/32433677066.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/56800423896.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfaee12a74---rimoli.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090659446fcb---45518168939.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4scnnua30q602n42pjfr2mra63/30846172920.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0365ecac---joliti.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjo039qnl2qoe5dmq8mqf35h85/kukudovupifiz.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c21949a807de73ee3772ec4b06947f03/kisufixubezax.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a93ed188187016ab78a994d747ec6663/42406872025.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fuxafotobonuv.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e264128f4ccd9904e6a5568a3bdf75fe/58239006785.pdfIn PDF document text
    • http://renknh.com/ckupload/files/podonuxovamuzutanosim.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda44c7034---pajilesokilave.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/82359902106.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd08c86d2---wemerozibupob.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/iqapo01eqt50nso60gbntj9ove/tisebupuzimotavaziloripo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/31964664449.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/giwazigezixavelov.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e97a50364---guwetunusagebilisabe.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_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10772 bytes
SHA-256: 6106effb22d9075838f041b5252b45852c1df79a3835c105bb539f01c4c5ad27
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 18652 bytes
SHA-256: 3d6eb50a8d48a988c7a739dac6d31f3a8bdbbbab367080ef2397e2e826861e50

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