Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d4152fd50d1525…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 17:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d88d84404965e6edc8656b7c9d15445 SHA-1: f3d5b91e1ebf7c60e50c6f73f346cab6097832ee SHA-256: e1d4152fd50d15259654c30f6b9f45df42a7ff27cc956d6ee190a69a3ed85c4c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and potentially disposable hosting. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/nt9qdbgcteklatjdoedd3bu3e5/risixadefikuwuxeva.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d4ab1a8c---piwegagipabawana.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c930aa1842---puvuvoxefidemogilutup.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b2d288094f6b6e0cb002875459c2cbcc/7818350766.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b390da485df9171d09bf66659ae174c9/49173247247.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/napibefojizunuvedebitu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25ea8940e06832650512b82239ae1374/5267545640.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1612d7f8c6---vitikanotamalinavotew.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f471191a43---97711073906.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/66050704004.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6278295d---gituji.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dcir85fqasq3l13ll8f641aic6/64033093595.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb6464c6ef---32519768544.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95888c53ef---fopepefoxebupobameregamex.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vesisagafum.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/guzuxirilemu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/papijar.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb3b7c219---97695030523.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/robazofokub.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/19984810140.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d7667100c210b156d5f2f7b098405520/ruvazeritafozakanefasaw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f03932b37949206b2e5e55346ce3715c/baladinepopebumemo.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/47412857537.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84151e14d---13545559545.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210702055404.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fcf0c1bcb---60014475078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=piriformis+syndrome+physical+therapy+pdfPDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 16192 bytes
SHA-256: 5862467ae2f2590ffff75fdb257047bd3b75b48d743f5a4c76abda608b73bffa
font_01_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 11000 bytes
SHA-256: 168d6b3c6201e61e8cedc4a63cb8bad8976b174032038b70983af409297040e6