Malicious PDF — malware analysis report

Static analysis result for SHA-256 985725ed0deedb8a…

MALICIOUS

PDF

101.9 KB Created: 2021-08-30 19:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0d3d1c1c3e3a98ec0cbbc308f3bc8e69 SHA-1: 3acfa10f796eec8769d63788375bdb463d38fad5 SHA-256: 985725ed0deedb8a45e14b87a67bd5a4c204a3bd39c1d5e3630eb57eaa84d022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bp4u5k3425uj1hp3sm3d0gckvc/fujedusixopogogekor.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/32982130026.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/fawiwo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcdc91cb3f---16592635900.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070a458896bc---41941020630.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/23030003703.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/64908311168.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zakitujekoteb.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b888615049e---6230847168.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/wamewunagomamaragu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/34570547777.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/64022866190.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/12384828246.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2182cd1ff9---6135212285.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16104fec821f73---kojosexugetiv.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/xenisuj.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/nitazabupapukozekil.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160859f03968bb---vekoliloxawowuz.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/30667335242.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/rilixewejumitivapipezoke.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/217d226a819877672a437168dc5a59cc/82436426502.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608542af154ce---91329204850.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609858662407c---10086274659.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cd41a5707---nenolobab.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f689cc9a01---bofapazof.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b3ecaec3b5f214d295c5efe22856bda8/70262583498.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kerepodub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=canadian+bank+bailout+2020PDF 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_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 10444 bytes
SHA-256: ffe7cd49254722ce7d6335595535730b5f1f37d400d29269007353d691fdafd9
font_01_sfnt_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 19304 bytes
SHA-256: 76b9d5bd368be4870deb4d36a47a6fc24fefb349b63e25ea8fd26fb2dfb31d98
font_02_sfnt_off00016eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1