Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a13222951671188…

MALICIOUS

PDF

136.7 KB Created: 2021-09-03 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d77a9336e2236ef4a12e9d75de3864a2 SHA-1: b4365756daa55a85da5906ab780484ff226aea2b SHA-256: 4a13222951671188f7223ca8fd41bca9764a7a4f3b731c871c18685665df8fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=binder+oven+manual+pdf PDF link annotation
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/v5rjuj19jm3tcukdeqpg6nq8m8/43673978326.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc87376b9---jaxemap.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/af24a875d9e9393ceedae0d4c7afe277/28203302666.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/79763082905.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5be0b8173b7e77d6ff4882e35ea68da4/22364824761.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8c8f57923d5450fc5682af9c9a96b472/17903231475.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aed9d4e7e1a2bca4a7d8996477264d72/60162075363.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f3d4b90c---fesuxazumixusoso.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b078e61dce6---wekotidipozipagef.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa8a285e4---wukusixetasovofinabos.pdfIn PDF document text
    • http://yibetter.com/data/files/puniloz.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/notuzosovuwonus.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/mopafitomamadesukenan.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ce2ie6kpgsvkmtnneo0ui46e6o/38532159452.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/mimakivilogivulegupodujiw.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc0b9bf3d---75369841409.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/77053802373.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c52166ba42---kegubureres.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/wuwifiju.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/satuzitugelupidinojir.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079727d6b269---xefuguwejowid.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/eg6culjqm54eqlah93adlffup1/wewuvepefakokofetezuwor.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/lisezepuxoposalozep.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dfaab763e---basugavusuzun.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e3705dd---26845647267.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_off0001a908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A908 10612 bytes
SHA-256: 973b6c2f62db8bec1df5fc670839af4abd4a3c2ad7b5bfa9c72957612523bcf1
font_01_sfnt_off0001c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D94C 23352 bytes
SHA-256: b324a8fe12313c2cda90c1fbef10a347676c0ba21ca0654c6b50df84b747c8ee

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