Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f4efd660248a1b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-08 05:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c63a2d70d1329e349fd45909ebaa87ff SHA-1: 86ef40d3fa6cef3fcf09b7a582749581373dd6fe SHA-256: 35f4efd660248a1b79f6513ca9f0c2b6f10eeb4d2090e5ebd0d219ba16647481
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'Fake CAPTCHA' heuristic indicates the document presents a deceptive prompt to the user, likely to coerce them into executing further malicious actions or downloading a payload. Several URLs were extracted, some pointing to compromised CMS upload storage, suggesting a distribution infrastructure for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://hydrogears.com/survey/userfiles/files/65032624846.pdf In PDF document text
    • http://www.520amis.com/upload/files/lagafivowex.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a60ec4f5b---56353611852.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc967194a---menijutajopewelekemagap.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a564f37e07---mewukefudetowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4039f5ed42---gawofevikebu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3ddd4668---kubugor.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/norubotus.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f34dc733---48367914088.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077052601ce8---27774210565.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160800cf843902---31533765887.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c2lq7ml27bfr9urhdqdmvm3m3i/vemike.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8725805e57504c01b74746ff589194ed/nuwopo.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/kediragofijugogowafenabub.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/31ce298df7def0cdab637dcc93b262fa/94235258376.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82adcda947---papofo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8145b2cc22d554db347b075b00d9d00f/pomaxewonezulilawe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7b0b681fdeea0df21cf687a6b417bf20/sadanupovude.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/43231430857.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a16a5359f---kapitenewajav.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/688228674.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c035a861cb0c4bd400e3f017a0fa704c/surovuledemuposibotevumu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/muxexilo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca9bdc4e2---70478786228.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/32971f3f8b3347624df52346a6c78b34/galazufibizemofelilenud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=instagram+private+account+hack+onlinePDF 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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 11032 bytes
SHA-256: ccac1665622c41f0d5ceee8950ddb280f19621a33696d6fbd66a1719c303047a
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 17212 bytes
SHA-256: af40359b7c90865a20dc81345cf478b4562d097a392753bd2240e30fb0396f52
font_02_sfnt_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.