Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e21ad18b668fdf…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 08:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e658ec4fc163e45159b9c8c690de4de8 SHA-1: 10506b4ce7b00063ec8f6cc3038f4cc31226c2b9 SHA-256: c5e21ad18b668fdfd0b06197bd7de63286d8b1f05d7dfc5591b77d7ab8a90928
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5cbb9f154---xeduxiweneveromikunu.pdf In PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/xixizozeri.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/99497818889.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/ganamokara.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291b4cb9015---fawaro.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/dekeri.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/976ee1d4b4dabdbfaf4e5c8aa9991a58/sufikamagax.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xowarenelelegiferupijiz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/53n7brrp2eq8plrfis0628d1ov/dirizukugagewemurudelixox.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/85163693890.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ff51e7ea---texixoraresovak.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df82c9f58---dojojezulurewezi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c9c77880b---budamuzu.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6f00f7e24f3cc616c666802929676d21/84598826901.pdfIn PDF document text
    • https://seerupit.dk/assens/file/84855880360.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/51558618853.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/40935026193.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/xonow.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ni9kok8m6tu9t01jd951vq92i5/84691776508.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6d5f1911ac2280bdba95042ef4ec8f84/xagajeporulov.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c300d2abc---17003680989.pdfIn PDF document text
    • http://stylekd.ru/files/31738363642.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kawexoxuzisapozufim.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/76397687953.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/51340739752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+page+from+pdf+foxitPDF 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_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10768 bytes
SHA-256: af46f52759478807c5c9631e37e7d5d7fcb479daa8da1aa4c45626c8d973fcb9
font_01_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC3 17556 bytes
SHA-256: bf28c37bf47d8ad00d4f23c360fa671481a53c5990a31a7f643136992de18181