Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa49d969da77189…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 18:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abba130c1d55558010ff042be2aaa2c9 SHA-1: ca6a97b20fbe41ec6c4a21df5f58d17cd6fe4f36 SHA-256: 1aa49d969da7718999b8c0058da9028496b06ca183cacec85b71370b9be1e0db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to trick users into downloading further malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://hydrogears.com/survey/userfiles/files/59676779504.pdf In PDF document text
    • https://exam12.menapoint.com/app/webroot/upload/files/41938364772.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/66333450718.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b70befd8ceb157fa8a229c576fae656a/18873899935.pdfIn PDF document text
    • http://tsydesign.com/userfiles/jws/files/gefoviluvaxoguzaledegu.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109201444271934.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4af61cc1f---17825956133.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/dusixejosixoleje.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/larapamerisezaniz.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wimimewiset.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/15298957471.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/naxukugidiwodakudar.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/34392875448.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/xedesokufovenon.pdfIn PDF document text
    • https://labelmarket.pl/data/file/mepemi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449711f362f---32203838709.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/livifa.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/55131939205.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/86955191844.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/76648263326.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b7bbfec41ac664a6feebabce3805eb13/dobupoxugiwafopawujakinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=native+ios+applicationPDF 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://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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 18132 bytes
SHA-256: 29d325883bc582f68a1c21a99beb4ca619cf30142400bceaaa2d77c2a3e0714a
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 10312 bytes
SHA-256: acce91c91aaa4ee6d396bc447eb08eee8e46331ecfdd9224e2cee014416724b7
font_02_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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