Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aedba5919432146…

MALICIOUS

PDF

74.0 KB Created: 2021-06-13 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf2e0002d539f1f1e6c6631eee783f63 SHA-1: ac8ce9e989144ae0cfe055195469e3efc0b92364 SHA-256: 4aedba5919432146589b1ada6fbeaaed19a4350cedacec5519cedf8a6441886a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of `utm_term` parameters in some URLs further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=avatar+telugu+full+movie+download+tamilrockers PDF link annotation
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/92a49a9bc9faddc28237c7075dcf52b3/15039068574.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e30596c5---52858130389.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085580a18cff---20820154030.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/25969795438.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2ueioojlteki9294vlfs9u410r/99753890670.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8655a0b776c17af55a93b60bba4cdcda/migef.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/7be4bbdbc2abf9b1d3cefed85cac366f/35125609881.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/i23j9geocm1ag55penh82g37ha/ruzetuxodigoguwugejoze.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/vokidurufuvo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eabc9d879---nenuzedinugafema.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0286bea7dfae662f34b5bc769ad60de9/moluzeluredumagolida.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/zipipatuzabawona.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/15535033577.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/89223846113.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816039eb905---luliduxumobudolorurakifap.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a385daf9---25291201954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 5548 bytes
SHA-256: c4e24f74b696e7536040406bffcfee12bc485462f8ce7d880e8c6cda906e3b7d
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10696 bytes
SHA-256: cd4288cf68d27480e8ee3ff9328ebc34786a808091785f5e6d27c78192facaf5