Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d77299db37871f…

MALICIOUS

PDF

70.2 KB Created: 2021-06-10 01:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d8d210c18a1d4725754b3f207944a1f8 SHA-1: 8b627f161b333c1266bf5199a2b34852c9a9aa87 SHA-256: 59d77299db37871f6beac8d0b306bac7d40ccef5f64d7b0ed9a1bd148c2e3d7f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=motu+patlu+aur+video PDF link annotation
    • http://jarosi.hu/files/file/54616295826.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4ceb4034---tomiginazumixek.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93dfc6f842b5a590e9bb3c3f2add0e5f/figojuposaxov.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608633210a53f---62804044139.pdfIn PDF document text
    • http://614move.com/clients/4890/File/57549451425.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/xevegufov.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a0a115c7408f8e5b7e5b75e22ca8b676/74949013236.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5891190bcb---gunuzodotosazusefegarubev.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cf07705b---51193266242.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/rezakuzigasedajexidinuneb.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b7f76e331e36d7eab7d4d0831f775b6e/batewopulipopepekagu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bogewemo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sikfki6jh2vgb7rfb6lgln3eit/kidilipa.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/bopevifataruvobimuga.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/26797596639.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e9a62687575bd3d25aa133a09ca9c44e/guwusimovagi.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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 4840 bytes
SHA-256: 3a613c12ec1d26e579cb4343e63c0e887b95a2ac501d1f33b2bf6398df345324
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10624 bytes
SHA-256: 18e574ea3a22ff24618349e92c8054051c84f52ddb9a18f3142f77f6e28671b1