Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f3d01d6e39d1bf…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 20:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfa6f0bb36d44d60412ec8a7770d0bc6 SHA-1: ca831305a24e201fd8c06ce95a8388040cbd78fd SHA-256: a3f3d01d6e39d1bf43bcd7e772d3f07cb893cf407f8a915c0ed4593b74538195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff21b49ad9---65249646778.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/28094335837.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fopokogireg.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/guxuruwapavakem.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/raa3avq44696o4mo1rltif4k72/8627605057.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/jemezejuvanubop.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/kaduso.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/73125614615.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/bavoxazixu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6b8c4ff1---25955128782.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/92414213466.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/62425394814.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/576275519.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143e3019c10e---kevazanudirowogimozamaj.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/9615617265.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/jiragesigutamulim.pdfIn PDF document text
    • http://newmob.it/userfiles/files/66295736575.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/runamofamimepuke.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/filulelorumawit.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/jemixuwofipunubatekoximag.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/78101956306.pdfIn PDF document text
    • http://josquin-capella.de/download/97715914391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+wrong+turn+4+online+freePDF 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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 18068 bytes
SHA-256: e37fa43e1d8c1358844ac8d330043b65b0dcd85b5ae8a7e24788415e5a8cca81
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10704 bytes
SHA-256: a8d7436519654eb4e55bf52718523734526d9f0c52b3c8a312f861b15e0c0a52

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