Malicious PDF — malware analysis report

Static analysis result for SHA-256 f295e57340057504…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 19:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71e1d0317c9ae39db941609a6e07aea6 SHA-1: 392918ca154c4f01daab7d338f7664e9b0bd39d7 SHA-256: f295e57340057504e4de7ef283b662f9210fde517f3eb389d231919b6f66ac6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

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://at-studio.tw/app/webroot/userfiles/files/20210707_183722.pdf In PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/gawuzudubufufodiralovo.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/21011886482.pdfIn PDF document text
    • https://mollis.rs//files/wujuwebebofope.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/65070163347.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/71003853178.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e252a7dc1d6117d1e0d372293f2972fb/nitaranuninusud.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1250262620611c95f2e848c.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/ruterizivevigigizi.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/risurututinusadekagaxatut.pdfIn PDF document text
    • http://web5gstore.com/Files/files/tuxasovalajatik.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/duloxojuri.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/46662075613.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/37761485712.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/gafibosekaloxiwena.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oq01gha2ok92g7b82hec7fujd7/wijumomiridap.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae33a96e14---topof.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/97594878449.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tcagvftm6qnrvalcjlo2ecpjl1/83106813883.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/temawenusomibogogavim.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/17616153007.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/96407197669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lansinoh+manual+pump+walmartPDF 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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 10528 bytes
SHA-256: 27b1a86f64e11dc9cdae6d34f3e9a368c9e3f60f51fe045dc856058cf3b3ce3a
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16172 bytes
SHA-256: 483341a82cca1b98c136f9c640674c9dae064623b10cc6e35c0dff6706b59a2c

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