Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd4f6314c8aec77…

MALICIOUS

PDF

85.4 KB Created: 2021-08-14 00:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: db07d8bcdf2278283ff51d620ab61ad8 SHA-1: 446c21bfa0b407f857cd27c4d0a0b5109d64dc42 SHA-256: 5fd4f6314c8aec77a7e49ca6df5be40449905863fb3062f3f99084af9296e104
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1204.002 Malicious Link

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. It employs a fake CAPTCHA or human verification prompt to deceive users into clicking embedded links. These links lead to various domains, many of which appear to be compromised WordPress sites hosting further malicious PDFs, suggesting a link farm or download lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://laborke.ru/uplcv?utm_term=god+of+war+3+for+android+free+download+apk PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbec8d96997---buwasikowabagorezubivi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc034199e---44129910954.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/97203968941.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062819013770554.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8da851d8e---xuregaba.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/18289619718.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/vizodumolodega.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/doroxanukusesetu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160807f395a6dc---gexoli.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d491fa5a547---60771477075.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/97618915265.pdfIn PDF document text
    • http://inercial.es/uploads/files/bekegizokaguna.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b228c6d29---61949384142.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160867e77d4a69---29252007619.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8841f67c91---kavuxeroga.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/64587611336.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/zuwadezezamawolarupireli.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/fibatajug.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/5823293534.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/76358021705.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/13369510970.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/08fldrmatqkn23u3i9fh7tatcc/rereliwemolojur.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161067ca398c7f---veresulajaraluvuvopezafu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aacbff61720---monegabenanezo.pdfIn PDF document text
    • 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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 17140 bytes
SHA-256: 83c55b49a5fbb79782afceb54465f06788a6437e776cd8cd568dd00fa6a55610
font_02_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 10616 bytes
SHA-256: 5213c4d717098fc79fb294c4681118428e909b44bcd94f668e814fcc65c97194

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