Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c78699a4b3eb071…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 22:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2abd0760322a6b4a863ade4bb3082ab1 SHA-1: 00ee0a12266603012bffbe79f5df49a5d0f4d0fe SHA-256: 6c78699a4b3eb0712cee7284d45ac5554bcdf22285813d45d6532b62127b2fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users through multiple compromised WordPress sites and disposable domains. The primary purpose appears to be phishing or redirecting users to malicious content, as indicated by the numerous external URIs and the 'Pdf.Phishing.Trojan' detection name. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=inner+outer+labia PDF link annotation
    • https://masterjobintl.com/ckfinder/userfiles/files/92842167927.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/peposalutobanel.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609281ffd7bc5---pekibipijabovutuwakixed.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7594c41da4---wipizemepuri.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/87190312155.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6sil7a9tnqi6rk0e6ib8qav9dt/80799475909.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/13bdb1c33dbe3bc2c556d125f7f617e9/bexaxodotafe.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bafobalepetolupukixid.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/oh4jba4v1a5gi4c9gh29ur8jfk/lomojatavo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q90evbind0m54rdqbm947icnb7/79429678917.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c41be3d9902---bovukajemir.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/15187975696.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/fuxot.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050113011230.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/73ab1dca9cdde5208f5381b906bcf401/fifiredevebafep.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/30f36007e7bf316693365fc6f512f2fa/71605533168.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fd35beda178aa1b5179348d1afe9f2af/dolinatiwewusinavavi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a7f69a85---bajokixibanafelinusokox.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/91718101991.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bc89b9138f1a17a82ee8361528885ba0/nomavugokejetefitutiv.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/60170624025.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/83920293614.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8a72415bfc8be6d3b665ecd9c2db7736/50142888560.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/29870a0bc87da14344e13ebdbfd1b38d/girixokopepujebajinurebex.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51cc2896f---lulakida.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/96785760118.pdfIn PDF document text
    • 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_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 16816 bytes
SHA-256: 81c3b87e57afeb224023a54fc7b1fe2940eb2102273a0de4ae7f9436850874db
font_01_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 10124 bytes
SHA-256: ebe4f467f77f8a50935eb88ae9a009d3799e8cd58464f4ececfa91d43674ff4b
font_02_sfnt_off000142c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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