Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6383fb727cfcac9…

MALICIOUS

PDF

90.4 KB Created: 2021-07-06 12:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c128f44f8d043b28f3bd96c7724df6 SHA-1: f4b15cdd8d1ddc61a04bb0cf3cabafaf60fc3487 SHA-256: f6383fb727cfcac92045ce6716103f5b613536efe6430ab03cca097e99f80d0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e38d6cbd790148eed30575c4b3a75d5/67611044326.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/db34e6f9189ed5e5e2d261f9d14b4420/gaguxinebopepine.pdf
    • http://szzxwx.com/Upload/Upload/file/202163085828139.pdf
    • https://maggies-handmade.com/UserFiles/files/sitowiviziruragomen.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b65a319eec38438a099ee78d4c97bdec/96642509339.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c30c700e03037b075d7e635de9f42f3e/11354696136.pdf
    • http://epoch-making.jp/js/upload/files/sewujan.pdf
    • http://integrotech.com/zdjecia/file/sexodazomedojunena.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7d65b429---76770830341.pdf
    • http://luingpyrex.cz/foto/Image/file/tuxilujabi.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c751cde71ac---41595386681.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/zupefizimedimuk.pdf
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/juguzunedasunavediwakeza.pdf
    • http://kayapaliinsaat.net/file/56786084243.pdf
    • http://gowowdeli.com/uploads/files/4619562517.pdf
    • http://candientushinko.com/images/file/nasuzakipisak.pdf
    • http://auapp.ch/userfiles/files/57970818139.pdf
    • https://n-v-v.dk/userfiles/file/maponuruwewe.pdf
    • http://doktor-okonski.pl/uploadimg/file/legovasurisuwa.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/caef89d5d97b272970b892e3b7d2b49d/72241422277.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/87afb7176b3e4b281aee163a4f821977/33505557932.pdf
    • http://afgventuregroup.com/cfiles/file/15466659544.pdf
    • http://ahkjt.com/upfile/file/jofikedutavebu.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a949e38e7b4c82c020b6f47ca190bed0/bezuzavinolofudamu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hack+in+among+us+android
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e705616fa3---6405260917.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16792 bytes
font_01_sfnt_off000117c1.bin
4d6bfba5d1d2a5b2a4456abbce803d8a97a78dd37cfda1b8a8500057b74aba04
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 16604 bytes
font_02_sfnt_off000142ff.bin
bf5a17e52fa5a812c6e1afbc571a37f737fa7272a48cf2860ed286123fcbd874
pdf-font-stream PDF embedded font (sfnt) at offset 0x142FF 10620 bytes