Malicious PDF — malware analysis report

Static analysis result for SHA-256 186641b5099cfe0a…

MALICIOUS

PDF

214.2 KB Created: 2021-07-05 05:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e1574c4b8ec81c621cdb3746dc876e5 SHA-1: 51638189ec43cb1c79b982f4629f649e7fb6f202 SHA-256: 186641b5099cfe0aa144055edd042f7d1d7c97359833581767d2b119b5eef025
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, with at least one pointing to a compromised WordPress upload directory, suggesting an attempt to host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9548

Heuristics 5

  • 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.
  • 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://capital96.com/userfiles/file/42448517525.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/zurokupefejapoju.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/63b52bf394d9ccd034019708855b2028/gijebunilolas.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7e064313---9342658028.pdfIn PDF document text
    • http://klhl.com/userfiles/file/terujamagofew.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/5764552602.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/85098453780.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/311qts1qcutc9netksgd2onmvp/dupitorarowamimip.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/eqmmg1ua7qv9e5jqp2j2p7s3bi/86360178483.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/kagetijabu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a055bc4c8b4---redesifitiwu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4370d9j8n5b4bafcu9dp3939nk/24425521593.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/16387224582.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ff1ljq9ugbuu54ja28svuv935c/33838665719.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca10631fe---61734454298.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/mikuni.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e094291c75d---2890128098.pdfIn PDF document text
    • https://belloverde.net/emailer/file/pafujoj.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/56d9b3d6b6404bfc78e002da4673bd63/41930859705.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/gibepiz.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd4b71b2826f60de422582f81d30de07/78463802244.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec5e61d77---rajukasatibulu.pdfIn PDF document text
    • http://adveotec.com/img/file/13066724029.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/vafokosabisijenitumo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d638e01b5f8---223353368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unit+for+measuring+radioactivityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C7A6 11060 bytes
SHA-256: 0d9567be85a28d96850eef36e803f324cc98da88d1354c2a3b48650c23dd2e41
font_01_sfnt_off0002e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F954 23632 bytes
SHA-256: 3efebcd19b35051f060e536d03c9fcf1002a136e4f49fec23d3d95d55158db10
font_03_sfnt_off000335a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x335A4 16108 bytes
SHA-256: d0eb2f76bb0702b75bf5f25506cd2b7030fc50cdab4ab9050a33867219fee3d6

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