Malicious PDF — malware analysis report

Static analysis result for SHA-256 e621dc83852ff6ad…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 23:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b94fc665d77b64db160282a11dfb0607 SHA-1: 713ed42b6def39a00cf3a30b0073c4dffefe8d7a SHA-256: e621dc83852ff6ada6b89faf542de78e49ffde0ffea39c774d0b418c86ef40f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this assessment. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6645848b2---80885742303.pdf In PDF document text
    • http://darienhigh69.com/clients/866565/File/bozoxo.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/96929010374.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c141ade63---mijujulota.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ed58085b8978bad2ecc418aa56e73b90/32499443042.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/taxibojujiseju.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a366c6ae103---barajodurukagafu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/im90us4sa8vgrat6cajfuc0kn0/sejujudesezixupenowilise.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/81113717484.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3jk71sg23dfirk3ir47an38qni/vewilorudibo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c6bcd8cf---depusizojidafabasar.pdfIn PDF document text
    • http://www.heksan.com.pl/file/41904295407.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/t37b2crt4kthndcnn3pt8rjnsh/89661801844.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609160cd390b3---wokox.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/6507425486.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0ff55f35---1173699815.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cd95d87252190bf1e30f2396dc6a4702/kamepi.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/botupizojifabokem.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956e761cf9---51667433573.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/58us3lk0d1cng9uuuclhqk5gq7/70437023921.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc328efc71---sekekabibe.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zotevubivomepomotebunepog.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbc0dc5b1---40333208354.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qe4udpsrgepa03u17dtnlc0jea/lajigabebupun.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ilfcge6gfr7qgppfejgjvecqhm/gevadobodozil.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd56252e6c---16354505592.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sufujorubaluzosaranuj.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/59386796582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cbse+class+12+computer+science+sample+papers+with+solutions+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_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 15604 bytes
SHA-256: ecaeb6a4f041d5406fd9b46e3509251df4908860b6c44c19398229e5084f0a07
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 11412 bytes
SHA-256: 2dee928cef7c2d4b2b340e420562e3428fe27dac7794ec22352433fc89bb45e4
font_02_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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