Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c541690ca45139…

MALICIOUS

PDF

122.7 KB Created: 2021-06-20 15:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7f625acdd7126c4eeb91e35177048314 SHA-1: b56adb927076b3a519fd9442919be3ff73d385aa SHA-256: 91c541690ca45139b4ab5f09df9c10c49daaf90da800a77e4da30362054a8a95
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites and disposable domains, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://haysalon.com/public_html/userfiles/file/jabodidikivokekupudu.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6fq1q92187kbaktd13nhdvce67/fonejuvafuvo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070bec2bf174---22871186903.pdfIn PDF document text
    • https://werbemittelag.chupload/file/99840993206.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/simugip.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/bf62336c431ab23ecc4064ce73a55269/wetukiwesiwavenesev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66729cd114---96828475487.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/viluxorironemarutoluxerif.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/fabubunomesobemevufusiw.pdfIn PDF document text
    • https://businesslife.com/content/file/ludemubotara.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/72725490136.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4c5d38653d64d0f518bc13e743e0cc0a/12404032933.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/bitogudibiruxabi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48eec838a7---raribigerolovitix.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/walisutebezulodidim.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35203f67f---73503140727.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/652bbe0a913ccf8eabaa33170194e728/57582195735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+mega+xy+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD2 25560 bytes
SHA-256: 13427ed961a657bdb0c0ce30d2e358ffcb55d7b5ff6a252fa3d06f6fca63ab0c
font_01_sfnt_off00019087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19087 4856 bytes
SHA-256: 1166b116cd704bd18b52ce1982a905eaeab5e478c72d86d5c2e8921a0b229953
font_02_sfnt_off0001a103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A103 14044 bytes
SHA-256: 92f29480e7ac1c95a64e85a2d3111030e30739f2261bed7a8fcad696fece57ee
font_03_sfnt_off0001cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD42 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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