Malicious PDF — malware analysis report

Static analysis result for SHA-256 9590e7f95a3e2199…

MALICIOUS

PDF

92.9 KB Created: 2021-07-25 00:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f164449f51189198bea3b14a62df4cc SHA-1: a03b5c5f4d02c2adc5cc23082dddabe773eafe61 SHA-256: 9590e7f95a3e21994fbbcdbf615628f1d2dd4079d73ab8a94b964a3d9e44a1f7
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and social engineering. It contains multiple links to potentially compromised websites, suggesting it's part of a link farm designed to host malicious content. The document also employs lures related to browser extension installation and callback phishing, indicating an attempt to trick the user into executing further malicious actions or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a009366f3e8---45404274242.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de6820ec5---59633354241.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/sodupotuneliromali.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kemowi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4b568a49f9ca34bc99c6f3143e6b780b/6795003961.pdfIn PDF document text
    • https://strechybenesov.cz/content/49607781187.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/pajukidalame.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/zumomewofojugedo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac614fdfb97---28538708593.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/beafefc5sjthg2fnrr3eo7uce6/84408657468.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/rimejefopifevamezuf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd397268706---ritisekoforudaburosurosaz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f6e887739---ziwerebejulesajigoj.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2rh6ejonunca515bmpiagspfmo/545074692.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/85314811893.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884a48e1f48---situf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90a5a8ad3---vebavazofanafomexivudaw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/74bf8fe7a21de37bc00f2f38b1bf9b00/20693160611.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/denupapilexudix.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/gekeve.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/lifev.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/zawujijevuworisudogile.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/74233889135.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/61c8df01d524677a76db89d9f3ef9b3d/77304956386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+4+mobile+apk+no+verificationPDF 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_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10888 bytes
SHA-256: fd16f8115efabf8f45f808ebb3c88c64cd9b5cb65c82fef8d610af80296d8c88
font_02_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 17316 bytes
SHA-256: 1474bb00423f6bea320d2b4b07e2c4a55f2eb517969a1ef812360355be3509c8

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