Malicious PDF — malware analysis report

Static analysis result for SHA-256 da90553f048dd027…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 07:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 563a27e47fe73478eaad9e96887553c4 SHA-1: 3bab7daf3568ca62e6a9d2d360e4e84a90fe511e SHA-256: da90553f048dd02735ddd3ababb5753ba522ed89bcb6f04ab0f074bed233f84e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised. This pattern suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=auto+login+facebook+android PDF link annotation
    • https://movimientofamiliadejesus.com/images/uploaded/file/70142996652.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/pibog.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/tofoxuzunaguxemiju.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/loiv9qrneh8h64em2pomrb48jj/30722164189.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/veworenotedalaxaxitokeres.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/12029317840.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/zokewepal.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906081832.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e158ec5e7---mogukapu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/88778406547.pdfIn PDF document text
    • http://hueide.com/upload/files/zozulelu.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/dipijetopud.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/33862142316.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/worekigodexavow.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/12518524589.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/11364045067.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/69527553404.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137896f5284d---75744684783.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/levezis.pdfIn PDF document text
    • http://arsvet.ru/img/upload/9099363796.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1be778052---lanomelotazeveruzag.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/70163571926.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/11033758697.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/narazagiramefuputad.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/63832740850.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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 17100 bytes
SHA-256: 21fbf11ecc8d4d4964668d123a799f36f0a123c2dabd88b451ba7d132f7a9314
font_01_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 10796 bytes
SHA-256: caf10ffbade33674fa7ca22d12fc3f1a74430cdd52c11201a97750ab9c274e6d
font_02_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1