Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2cb5654988cdf0…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 05:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c9816e87b7f0fa76fa1aaef9ffbd95a SHA-1: bb7d5b613a8609665bef6746d83fade85d7eaed7 SHA-256: 3f2cb5654988cdf0925ec9f27be72ba979555ddaa6d2bc9219fc022c8e930c1e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/xolaragebozi.pdf In PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/16478708287.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b16c025c4871c3c3d1f8498c001e23bf/23064642232.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/davedelogo.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/58949060127.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/78803297445.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1aca9aab6c8a5f72062bd082d62198d/powobidek.pdfIn PDF document text
    • http://candientushinko.com/images/file/bebudano.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e3a5398b197363766eab95e1e0cc158d/nadude.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/42416784278.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ad7464c959f85e2a372edcd2cbd0f823/37462295876.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dovagisujineregofekurug.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/joropuwuzuwoxazegisa.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/478254cc824a661c927c6f0f0ca46463/75746272034.pdfIn PDF document text
    • http://northcity.rs/slike/files/pufikezinenu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160da7e29080c5---ledif.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fa498d3479d339e28499884eee5d6e4b/18696218434.pdfIn PDF document text
    • https://x-software.cz/data/file/31673719456.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777dfca5f5---pekatovilenanamix.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/89819337788.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c3679a82---jamuwobavirasimiwisusire.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2f5388b333cb567a4907ba9942420449/925611707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=common+french+expressionsPDF 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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10572 bytes
SHA-256: ce37ab2c7bd95c73cfaffdae9b3076e1aa740c12a1982212ce75bbb4a95552c4
font_02_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 19336 bytes
SHA-256: e0f46a92e91648afe906fb2a7f7e916803fc1a67aca4ef1fe557cc9bacaf9863

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