Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b14a56f215fd3ab…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 06:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d50efe34370a17241bf37b0ec66dc79 SHA-1: 6b4e67f9c550627fb3560340333193e7fd62cca3 SHA-256: 7b14a56f215fd3ab28570aef978951e42fdd21e67e0fc4b87b27320fca85539c
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inlygiaylynhua.com/upload/files/39931770406.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8mie02dsuse6rkou2f5gib3m71/kojapebiremokeloxode.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/vukeveboperivibafez.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s52u7k4h79eurjp1qe5ld46611/xasilufabatiz.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/paragolaronuxoze.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lebixesoxitow.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/lekofozeji.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/88713882884.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/lafotobib.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc9399ab7---zolosobaxafaj.pdfIn PDF document text
    • http://dges.in/userfiles/file/kisemozijaluxefo.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wavefa.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-22/20210522233632762764.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ec0ac224c42aa910735684a83931c9be/20298513798.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/jolazuxowulexemedemedip.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/39428727538.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210620043735_plgt60.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f4d7dcd407b20a6711afd16ef3a652e1/9956755574.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b7626bfda---galiwagovozosizorurex.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/10070244273.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e18471d5a90---tonimiwazivixeginim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tens+frame+templatePDF 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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10268 bytes
SHA-256: c22f6cca90c05a206230af02b6406c40f7e797805eda8036d22d14a2e8d34a70
font_02_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 17304 bytes
SHA-256: 1599869a6f70336e75eb7ff4d7dfa58ad54f3a0db697a28528d63aa0f41997f7

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