Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5bcec9be4125cd…

MALICIOUS

PDF

83.0 KB Created: 2021-08-13 01:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 382a06b5eb0715f51698806a15a92c48 SHA-1: 11f4fb05019d5a261c1d15ab0df3304146b30d35 SHA-256: 1e5bcec9be4125cd4a67cc9838503706b4445dc8936685cbcf43801be6a6d5f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/917abee720184f0894b5622095aa77df/nedimumejigokijowitowe.pdf In PDF document text
    • http://sun-tes.ru/files/file/30606520017.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc84f48629---32839110856.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/novikifiliriruwoke.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/nogijifotiwixedo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/umi9k20f20a28tvc7fjhv2vs72/ritezapikup.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61905fcd5c5520a1f80738ae2ab77b63/14846613593.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/15056351411.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/tajedupufu.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/fegogetovigevuf.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/derimosaza.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/taxuj.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/62535716063.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/18dfe5a25a9feff2b0afac4a888ad1d7/ledunapeliramisariwel.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622ba6e5fa---fazudikobufimebebumevej.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751acea7fec---32094967744.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0m3asrip6087fj60j6reooarj3/xaxanirula.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c650aee4a79---texutaraxupugud.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/58920891640.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/dipitofemexupuratagurelar.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a56bde2c4---winekigakaxanunefujo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4e5d47d942bf62c6c8139fce87a2ba24/78024210149.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/vulivumurip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rebel+racing+mod+apk+unlimited+money+download+android+1PDF 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 11320 bytes
SHA-256: 5f7b6898135b920ebac1b7fa3599c1bda8b6a3045f6dbdad244ee5e98ec47721
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 17596 bytes
SHA-256: 6155fc7074be18bae56ca2bbfc8a4587e28e80f58ea69911c0f4e2bbfe24abb9