Malicious PDF — malware analysis report

Static analysis result for SHA-256 490f3be31d70c76f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 04:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1c026fac033c4207ac4e390ffeff6ae SHA-1: 4592c50873c5426658ed8c8e51c43cec131e51d6 SHA-256: 490f3be31d70c76f70edfadb662d00a099bba10736034ad37138241285d70e33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. 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 malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fid-data.fr/app/webroot/uploaderfiles/pelemosubuwu.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979830a85b---jokejekafamepan.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f75e3711c31390da466f4def3b8fe902/wijogow.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/zajapedebofevaf.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/lokupi.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/potivezozakiburironep.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/vitegedalara.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/fewoduxizilezamoti.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/70171753587.pdfIn PDF document text
    • http://fitviewer.biz/files/file/7569980661.pdfIn PDF document text
    • http://builderall.info/userfiles/file/jipetelilurotovup.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/xebiluwojazafog.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b279c0bbae1---gimunemegiv.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/25699828564.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0569fe019da83c626e7f1866e76cd77b/bunifetonavefod.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3164378a---momuzudur.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sujn0iav074o9ji0v12707ii27/68703964940.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/i2tbm63pb3oubjam7pkd6jfsdl/siketa.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sofijo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa3850439---15218833640.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/malujerunaputazebivitene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=smeg+dishwasher+manual+nzPDF 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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 17724 bytes
SHA-256: 4bcc9c5f30ff62feee5c117f299829ad68915dc40a3f88ff9e1cc55aeda131d2
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10796 bytes
SHA-256: 349d2881a1e1c9dbb555454c4fa885010ac8733e1ade65a77b2183c1574ebabc
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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