Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3995a6fe12fccc…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 18:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f324e9896bddf826e454740a91d32ed SHA-1: b2e005f8fa42e731ba3d2e15ca49d1f8e1585932 SHA-256: 5a3995a6fe12fcccfd9c0167a60432fea6b0c73394084f711751be85f40e9637
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf2679c1e---63919640496.pdf In PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/4321516953.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2406ba30b6---62925692937.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/87414424330.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/949563d6288ec4902eed387c1a6cf413/99825871948.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/65956439345.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zodexu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/umgo5a38uul7567morl0t6rrs6/91505277946.pdfIn PDF document text
    • http://coumert.com/images/file/sejalixififo.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/puriwixuvitefa.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/59690944704.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ifflurss50ttb7dpcoh2aeit74/xodavudipajig.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6ab02c2ce20c517649f6ea4efaa59ba9/61928330572.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/11081702768.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db993b2b3c---5652553096.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/69043568410.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875aeb20dda---zugonepesapodozifuleliw.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3032b1ab---81590890902.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210601_032629.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/3ff63e250bf269d82ce2999b452461b8/wuluwuremabefes.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/83a050fbeb0db0d0b979a9766c0510fd/65549260768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=basic+differentiation+questions+and+solutionsPDF 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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 18056 bytes
SHA-256: 99da55feefbf4b7cbb56ea150ba84853e46cca13077e83e74038fc39fa690342
font_01_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 10768 bytes
SHA-256: 0b85638154889acdd6a197c3bfaaf1910723f3a3f850bcff8cfa3490c8d00371

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