Malicious PDF — malware analysis report

Static analysis result for SHA-256 218aa0f4ce4e567d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 00:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ee6a3a6abd3931f9cb73a44c659e0f1 SHA-1: fe2ddd27b34e534f8956fc8c60d13841f98fb31f SHA-256: 218aa0f4ce4e567d21b2f50c1b44e56acd4a1ee2fa2e5dd115a93b62be1a1eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://granitnet.hu/editor_up/saxoligogowuledetamobego.pdf In PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/69473075386.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/91380260525.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/pikiwon.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417506251c2---kurusadozosakesijuxi.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/49636697455.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/rokirajakebo.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/loxojowolavimuritafiva.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/77374117085.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f65e38268---kufuvuguxur.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/85c45ecbc81240d35c65278afae9c535/32144134678.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144dfaa50b07---mefuzavi.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/90932855275.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/92287616468.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/23221338283.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/fodasu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/vakewejebodasos.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/jawinisesepixu.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/wazuxoforusadadageve.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/mepurufeterixexukefawezan.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d8a30f2b99aaf502f2b47bac038148a2/18272149099.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/81416044519.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142344c65a50---17207803953.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/pelovokikalefofefaf.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-13/20210913185531719363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=us+federal+system+of+governmentPDF 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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 10792 bytes
SHA-256: da6992a4dda533954a3f52f8797883aa1f1f50599d690e46253872df9734208f
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 15720 bytes
SHA-256: bf82ffe29845e8819727f536ace31b4fe1ecaaf0f24a2c8e0795cb90e309cd37
font_02_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1