Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5710c9be405bcc…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 21:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7af076c2ff3bd375e6dd2fd112b96d97 SHA-1: 05e17b472e101a1a554430a609dc593d1fe8c987 SHA-256: ed5710c9be405bccb37129d32fab766c929c1b0ddfec86a51167480fb0d3f426
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or using UTM parameters, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=pokemon+season+14+episode+1 PDF link annotation
    • https://candica.pl/ckfinder/userfiles/files/rusipamovuzuvojupod.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/39826391285.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29294582373.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/jeletokogerovesap.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/45595261938.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/21839474755.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f39c5bf37e---vudot.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/404ff5c5f48cebd15e2246916657d7dc/mupivafufekivibida.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/86007223198.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/42242946431.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/ruvuxigogew.pdfIn PDF document text
    • http://4tyres.nl/public/files/pororibomemuxamokogominaz.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909135601.pdfIn PDF document text
    • http://www.pilartangguh.com/file/kiwapejuwibukijefipu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20211001_98A198F2C0485DEC.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/waxite.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/sivudon.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93c90f05a---ruguginomoveperef.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/pabarajubabuk.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/79324435326.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/9574240148.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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 14688 bytes
SHA-256: 18c9c81fcecebbeee1acbe913885e5e968bbb08074999945d86c0e7e6999e9a0
font_01_sfnt_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 10532 bytes
SHA-256: 35081feeefa6505809da50723725db7f9877b33298a576e846c9d98cf66e6441
font_02_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1