Malicious PDF — malware analysis report

Static analysis result for SHA-256 f683491303357563…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 16:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30f7ac4f1cc89b7837de86f1f4bc6641 SHA-1: 88951a25e8eb0a8d398bd876dff469d37c257889 SHA-256: f68349130335756328e376bfbf07a7b2e5e635f05b58f811a88bde4c33503d72
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 acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2r6i6oh0520tc737hros6692sf/72393174083.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3383ub43munbk89vpfhh7qsll8/wuzajosabinimekupega.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cedd0f5c---79369326333.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/s1bam47oarnahfc4cdahaeec23/16062416484.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d203347c66---gotatim.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/famorexakegide.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/wifimuruxemoj.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/girozin.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/14560455039.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/wuduv.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/zomugezu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/tobise.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dofawiwekefamupegezes.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210611_082349.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608583d0998ef---febanuvitoteropezov.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xujal.pdfIn PDF document text
    • http://newo.ru/files/files/gokarunovunazepaxu.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/posoxisebowupulavenuz.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/ninodunag.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29d86277c---82426291415.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6d32148f9f95e14bdb6992f2c7d9c021/loxofabip.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990579b7b17---77793833531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=career+satisfaction+scale+pdfPDF 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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 10644 bytes
SHA-256: 90d82ad39360402132631654ea05c77dcf868e23cac2f2477f3bd00058f00a93
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 18688 bytes
SHA-256: aa61ebf72342b462794f8b4707465e69c9dc4dac9bd42107768dee00a78c0ea7
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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