Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef1fccfd29e4c51…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 06:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eda8ed42a5a1d8eed043f633657c3727 SHA-1: 4297f429c087c76db9a975fcd240bdde39d629da SHA-256: 3ef1fccfd29e4c51eb4aa7d0ccca28b5428d54a859f7f81c4cedaa1978234958
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The file contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection of Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/55fc471a7608755d30766eeac18abb98/gowupuwowu.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/gavavubipuwuwagut.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/glmiveaam59ibbla83h8p8madl/86202278030.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc315e49642---daduginofuzumufuvu.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/64274999449.pdfIn PDF document text
    • http://kvrhousing.com/uploads/15552521559.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/33108589321.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/88142114160.pdfIn PDF document text
    • http://biomehl.com/images/content/files/ponirugeredowavo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7r6lmme39s9lb0t9vas5nt8nq3/gowom.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/biwakilusuvanakaravowepe.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/ludiroruxigonufugitawaso.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/femebusabop.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/78032484973.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/bd60e3fa41937a4301fda790fe666507/7678416726.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/81174330337.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/lawojowofibi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d93001569---11241531133.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a77b82b3---40389313605.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/botifofuxorasefogov.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0e46d589f63d59e1aa295610545ff319/dobipojuxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=networking+routing+and+switching+pdfPDF 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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 18028 bytes
SHA-256: 95582f6d6aeb8b7ed21d4cbfaa67e259ebc59595d3f4e19d7ae3d5273aa4e74e
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 11108 bytes
SHA-256: d1c98378aa4440eb7b987ae69b51ffb2573cc06390db6ce779044b7fa3db49d4

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