Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c923394c3cebb4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 22:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4a5407519b16ccce0728bd9d0efcab7 SHA-1: 2dcf02f8ad8bc9091e8d236548f8ace52fc04a96 SHA-256: 80c923394c3cebb4ef1af2f3115c33ce6afdcb4d51f5e52127729befb5ed7422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to numerous external PDF files hosted on compromised WordPress sites and other disposable domains. The primary function appears to be directing users to these external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://amandatravel.com/userfiles/file/78232513586.pdf In PDF document text
    • http://studiopetrilli.it/userfiles/files/dofikilapiretevili.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9980a3c---47841248159.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7b6d959a39a32fe9472dc721c37dd4bb/10399920552.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/6137422079.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/16395575625.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/75248274397.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109090428356107.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e246be10823f9892b2cee6c837b940e/gitugalezuzukevoxabi.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/genezifixelos.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/benaguzubopofinag.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480de64516---nikarezoporalevatiwilabu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/91517459871.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/bavufolemelesukazeduva.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/sodojosubumilimarazasiwe.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cc1898f8961233ae1d4147ed55fb01f9/nifawabipifuxupisopod.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/katafadifakin.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/27650916685.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddf3c06f---lasatevada.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109090849205444.pdfIn PDF document text
    • http://fitviewer.com/files/file/99534273151.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/20861369195.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/49435044966.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/ropodumorupiluxosime.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tobegagobituriwifowi.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/gefunigigurolog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+share+play+store+app+by+bluetoothPDF 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_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 17912 bytes
SHA-256: ec63b4035a6cbd2a20d8fcbf5ec2c329f392331a93fc20eaa440b223788e91d1
font_01_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 10584 bytes
SHA-256: 2f3c04097dd1df5ecba631394c52b383cc1b0b0dbcdab520bd3f3ed4f88f33fa