Malicious PDF — malware analysis report

Static analysis result for SHA-256 4006e84246f56f97…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 04:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c0687449606b4efcbb4f94e66eb6b8a SHA-1: d2e7fdb32eaa85f7b970ec4b67cef7ba9a48e9b0 SHA-256: 4006e84246f56f9762fb51dd8a49530e8a500592cadbc278d9735dc0647967a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of these links, combined with the 'link farm' heuristics, suggests the document is intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db36a4ad25---85737346432.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75affbc4d7---bogizejawatubuxid.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f84d3dc86---9116776765.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/773dd95e72a8f9f8d633762b96f98880/70927825770.pdfIn PDF document text
    • http://derma-dts.de/files/file/rubetidemozomofe.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2ef13fdd---mukirezefuva.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/majefulekenogafolo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/365hoao5ild7fg083e1aucpf92/18985119981.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/36316406793.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/43955594359.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/silibemadupekitazikawope.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/01d90420959f93c41e88b8a1853d4743/kexuwode.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jawegopexetilox.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/spe3800qjpomptrstlrdejikq4/liraji.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b433a7e2ba1---nodawigelafudutovisiguk.pdfIn PDF document text
    • http://voijin.com/userfiles/files/lumobanatuxe.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/buwudalujamikis.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/51955082300.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/sinuwejopatuli.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/gexamumuguniguwajirewoti.pdfIn PDF document text
    • http://zae.me/datafiles/file/48134709682.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o5vlo7cfhu0argl9a1uruc7mq6/depelimopetemotefoti.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/tiludabogobo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/56149226428.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/83dd00735a74878842a4a26a44ac7287/xavojikokareparesuwidif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=shrink+pdf+free+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://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_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 17124 bytes
SHA-256: ccf3a0e6dff995036e14eea5c947bdb7508872f2db7c2bb5b1d7c2395f40a5da
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10584 bytes
SHA-256: b6f10a7811e5dbc8b68eb5e504cd0d66f377c815748f5e13d8732a2ef403393c

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