Malicious PDF — malware analysis report

Static analysis result for SHA-256 522ef3a8c8862e56…

MALICIOUS

PDF

96.9 KB Created: 2021-06-26 14:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d9b5d9e09c35298d3e8dde66a6be321e SHA-1: f3b36938b2734ba661621f70aab7ee502d56935f SHA-256: 522ef3a8c8862e56dda6d69bb35961cb79b56ade3194f2eee6fea066acfa59c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=the+art+of+seeing+mihaly+csikszentmihalyi PDF link annotation
    • http://chiengthai.com/file_media/file_image/file/52247598734.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6mjf69vtgitgh5its30lktfm92/tenibelibo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/b9g6rq4fqk6vev8u41j6s2kl07/63495491244.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/milofirutarokidujawidupud.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/fefulasetejap.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/87356384833.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d35dc7a743c1d9c483ceedc33dfd0c40/fifoxune.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827066d7e86---95432457181.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ea625fdaa2dee19098f008f290d7ae80/37223270284.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8e1f3d19---medojerel.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/531pavm52qv8i3h6ns9uem4b4b/kimizunim.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f267c8791505cdb8d2b94b954e4669b9/dubarezixukuxoru.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebfbebfd7---favapogejixetitega.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107cea1e2c---79751576457.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f20772eb---gitedowopat.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/27vb2n7jmveleg4gh6ps8qaun7/86264111251.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/79470223079.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210f72606f---bugoji.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/pimujosusezuratof.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/poledo.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/sgat9eo2rfu6t301625r6nu5pa/molemiwivupemixupazaxobo.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/61166795971.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609de46da9e41---56286955456.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/52724632600.pdfIn PDF document text
    • http://www.jimdavies.org/summaries/In 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_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 11012 bytes
SHA-256: ea387213c82936212cb9b80965d80b106ee70a34c24dc05562eec8a60c1e7121
font_01_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 21016 bytes
SHA-256: 2baef153a859ccd728e58ac80cf7e35733f5a47b00aa6b667e0f1167df43fe26
font_02_sfnt_off00015d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1