Malicious PDF — malware analysis report

Static analysis result for SHA-256 031d7d130eaffced…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 08:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 171a18a05e43649bc5e575c590e51b4f SHA-1: a80e78be250afc5b0a9bb175fab804f907d98f37 SHA-256: 031d7d130eaffced6c928b29a5541d5f41be1a9660bdcfd5d18796a21a9a3a02
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.village-gaulois.org/gestion/ckfinder/userfiles/files/pakivifigijadonozojexegom.pdf In PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/migusenimibok.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/julemidobagof.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/2218277224.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/kunirawawivupegafawu.pdfIn PDF document text
    • https://basisangka.com/contents/files/73733233433.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/57868066613.pdfIn PDF document text
    • http://usagimatur.com/files/others/28872546616.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/sirirasaxasekutuj.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/xiwune.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/rixozo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/37897635339.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/zubojufudap.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/3023938388.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/55382623089.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8ad3bbe0---34126755122.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d509b6ed6d---18487778132.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/difetaweludekavej.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6e13568a---3583057452.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/repavesarafamolarix.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/57963827382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+an+app+language+androidPDF 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_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 18456 bytes
SHA-256: da89dc80a343ae59acc542271fc406c15c57c91cecc25f8d36e615611b67dd3f
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 10804 bytes
SHA-256: 71514efe36f9755bfeee908cd63bd7cf72a99c277b623ed15d445c071997476b
font_02_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1