Malicious PDF — malware analysis report

Static analysis result for SHA-256 65341020efe64b94…

MALICIOUS

PDF

75.9 KB Created: 2021-08-28 02:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9133686044fa78000849b8515cc07c27 SHA-1: 92ec947ca884b6fd2d8017f29285d7742b8259f6 SHA-256: 65341020efe64b94d2aa03132c735eaed4bf1202ec38bac9a42d50d7d0cc6660
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://maychamsocda.vn/images/userfiles/file/85820674099.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b1d3cef45f9224c12bdc0844e488a2d1/jiwakizakifarofuf.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7bnsaphi5q7g1cng9iu7rrkgj4/sawuxomerizajaganuw.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9e6f089f7b44929b3feb95fb4b110558/simadogi.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/736550535.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/67507562651.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/tamijowi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973a67667a7---vawazodotoz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607816d7af0ce---40560722818.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/957159414.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100d8e3dc109---sobemofiluvurefokerixad.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952a0a64eb---boxuwapepozokugilaribo.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/kexusozemodinip.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/51039726527.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/naxoxinuruxakitomaju.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/logemezekawufoganolak.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qglcv5boi81u6mhop9djsfken3/85684494928.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e41ccf205f76782f356822dbe12ed46/13278597187.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/1107645684.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b43e250cf287ff93b87d1e4d22e0ae81/kepaje.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/68943912463.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7m1iskm3qnonn0c8btpa9601br/98540427078.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/dajomiruloxixinurekixovij.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c5tr4rgikp84m76b28i77sv3s9/nijitizibatek.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/50762413721.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pelisivisesogonogab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=172+centimeters+in+feetPDF 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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10296 bytes
SHA-256: a6851b5011ad3a76fadea6df3423e1ff13757cde8ef7e3f0eb04886186b4f4a3
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 15724 bytes
SHA-256: 23eb67a2f8d12107a53df513a94c62b5159d24c732984fb6dd73ae454fb2531e