Malicious PDF — malware analysis report

Static analysis result for SHA-256 017a73afc38b27e8…

MALICIOUS

PDF

90.2 KB Created: 2021-07-05 09:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ba0ea6d51f37ee2093067abc9673f652 SHA-1: 2243325ef8e1a25ac0f3a1563a6d14729a8a336d SHA-256: 017a73afc38b27e829a2b8f37d709cf662d844c9733a36cc340eb4fa26ceb988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the overall structure indicate a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=can+anyone+learn+to+sing+in+tune PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd88ba5e9---depofudetes.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/69412331225.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/lolekip.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1dd7900a2749c5e5a25bfe1f31cd2961/2573190670.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dt29ldo1gsqmeld5192g4c34o1/gabokerotedunidaterajere.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160701acad2ba5---kopadukexukeviwewofegasir.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffccb53c22---gofifezisaxamifi.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/lobozixilazulifija.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/14114038440.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160866b05332bb---varodemagenumidum.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/35193483424.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wivasanin.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jubezajutativa.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/lobijexawide.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ganuvikone.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d3262de2---kiwevepavoridolebezasude.pdfIn PDF document text
    • http://moristas.com/userfiles/files/merizolusazateverarivexe.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608561f1d1020---72417394341.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pivagisavejegukabovu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ce77a7b8ef5---kevek.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9b70fc42aac23f79619228b953c0b397/70096509658.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210518160658674.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/m3mhde1nmu0evlqvh44r60q4ko/67736710955.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f010ca5b7a---gavulabitaxatalibijuvowif.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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10528 bytes
SHA-256: 8272d07fb919749061b2bbe058bc21b7a35039110ab1be6a8bef8cf719ffaac7
font_01_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 17084 bytes
SHA-256: ea8e8f25a2c084eec3797d96df8e39396ac5965fd1d4443c3f4741eff0d1b7e0
font_02_sfnt_off000141d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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