Malicious PDF — malware analysis report

Static analysis result for SHA-256 85767cc37d76fa4d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 13:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 849f39f718b4bc8a71b1c045ced924e0 SHA-1: db1e03bb940fa966ee83a976204f5bfb5b99480e SHA-256: 85767cc37d76fa4d782c8899c59a7580fd1ff9d825cd459c44d5015056690fcd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to PDF files, some hosted on compromised CMS uploads, suggesting a distribution or SEO manipulation scheme. The document body is unreadable, but the presence of multiple external links and the heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://sanders-scottfamily.com/clients/26926/File/62790253781.pdf In PDF document text
    • http://flex-link.cn/uploadfiles/files/jugukegulo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160839104bac13---kejotixol.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/48200850606.pdfIn PDF document text
    • http://imaginove.eu/data/Files/satikitoganotidajodowu.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/5954147158.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/wilawujufoxevo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70458102937.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bd9dade787b9821e128f6567f0d36d71/zizupoxivutilad.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/turexowofojagigegeta.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077512d901d9---bubejedena.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/95680c7337a5358b54c0faa364734b5c/lesojubevetobomi.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/68153269093.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/22376359625.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/gigeviteguvakojiwof.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/rexivedamidov.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/japopefikevezupigegike.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/56079622644.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/nopif.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0acaea642f---54173793514.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sonupisexanigo.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/72399295879.pdfIn PDF document text
    • http://1carl.com/userfiles/file/worozukabem.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/wowase.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117b0e14bf6c---mijesabexobodofagepenojo.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/85204658526.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/83021260151.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pimiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=surah+al+mulk+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_off0000c658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC658 10316 bytes
SHA-256: 616cf89988cdd78029a7505f7fe210ead7ab52624b86888cac5ff9f11d2527f4
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 19348 bytes
SHA-256: 4f1ba51345f56cb47ec4e1f357ecde25b13a652e7debe5cdff67d77af0071512
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1