Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b1c0d4d2e22b99…

MALICIOUS

PDF

77.6 KB Created: 2021-08-31 01:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa510954d0f83783454b74fd8469ae7a SHA-1: 218327d7b912e39000a674e61c9209ac0d4130f6 SHA-256: 65b1c0d4d2e22b998c6f9d2f91e49beb7fe1f86c830aff71828c6114a00dc715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure victims to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/v1p5dvh4c7kobf589s6u2f9kb4/vabaso.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/644edc8b83cba1cb7e791b9edd40cd10/vovituvegusokagu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/83a413c6b12124657791a5d72bba6d45/71579782380.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef9ba350b---99291498223.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lj0cs89fo0i3o1g16g8k6rikqn/90651257734.pdfIn PDF document text
    • https://istanajp2.com/contents//files/15433140083.pdfIn PDF document text
    • http://e-hematologica.com/users//file/75232312094.pdfIn PDF document text
    • https://filetorme.com/upload/files/rajotedelolo.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wupilulupoweletex.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa4e1c1f6b18eb9137efb47f74f88bd1/fapuvisef.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/17540365518.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/688299f6a170cda97f877cc575fe4b7a/60905060293.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc41a1fff---kujikoz.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/fulumuwo.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/34909138157.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/20662546260.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f47891ba6---12547986275.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0a23051a7f500aaccb03a2d08cad4fde/tolorebinakefowujifaz.pdfIn PDF document text
    • https://okazionche.com/files/zapejasenik.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/limopuzeg.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210625_F45436464407EDC1.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/vuvabofifezogex.pdfIn PDF document text
    • http://regmac.net/userfiles/files/xaxopimazodulitepimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=yosemite+national+park+weather+augustPDF 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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 17232 bytes
SHA-256: 34dfb88e81bd4daf8869c9e6008787233cfa8f675f3ef394532fee13859aba81
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10960 bytes
SHA-256: 45896a6f77e12043c05c9e94e81127f2569e7c3e706454511eab616e256cce1b
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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