Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b59d4e1d90166b7…

MALICIOUS

PDF

79.5 KB Created: 2021-06-09 11:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5f6c4fd9fc29c65739dc361b65a99c2f SHA-1: 4c5824361a7cd5d85cccad17362570fca628d4c2 SHA-256: 8b59d4e1d90166b7b6408fd162eb301d73cd49f8e6fda97cb3ca6aca219a799f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=bloons+td+battles+hypersonic+mod+download PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/70nv5e7cq1qglutb01894sb9rv/37849498012.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/35833017255.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/93bb1f18b0abc34173d7802a1a8a39e0/82403791138.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/th5vas7cvd455f1n4tch286ct3/kamizuduvumofofetupi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eaa78b406---bibutanubazel.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/91810575523.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d42af3cf---67970886624.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/75012904063.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b5644c639ea9a50a22c4f64a0bc296f/nusutowezefixa.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/84586903488.pdfIn PDF document text
    • http://industrialdevices.in/uploads/65739621627.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607460f6a117a---64382177623.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/69643953538.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/dezabuwiz.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dd943451---xemufokezev.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839ea540f5---jogala.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
    • 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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 5696 bytes
SHA-256: d54ef0de10e5a49d0b0c3d97b9f81db822b6d4a1385ef014204cc55a68b725de
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 10908 bytes
SHA-256: d47a362156030116e818155cc9cc26306638c195778a99854115ff620f2e5298
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 16616 bytes
SHA-256: 25da4d0259edcb98e59a4fe79427651a73902f0cb209792fc7f5803c2d85b23e