Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a5adcd2829af88…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 00:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b709e13864483384a7977f610d584e5c SHA-1: 8f0ebc3b2c1fc6929871057709b0150a89967de0 SHA-256: 80a5adcd2829af8808aebe6d2e51518a0bfc0384accfa16e589a9490a60ff1e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites, likely to facilitate the download of a secondary payload. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3486345873a3a1f6ad8eef2e1bf40660/24796960.pdf In PDF document text
    • https://hrmconsulting.biz/upload/files/73254872853.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b038db349b---77789370343.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/50552526069.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fanutukuzevuxobilesokilip.pdfIn PDF document text
    • http://workontext.ru/media/file/dewamite.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/xadubalu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/momejulatokufusek.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9696e49496cc9e796984610607405e37/92308374300.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/73756518929.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16139171ec7a39---petibaninegex.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0e0dfb6b---45460848422.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/16955655339.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/xejegurulosukofibamipib.pdfIn PDF document text
    • https://kultmotor.hu/images/files/55894438054.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/biniwuwerikatinakob.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef97080a36---60119062106.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/pamepesikemoxip.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/71846951710.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/34933140666.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f9363cff---89355608088.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/bumiburejidonavubelazo.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/neduviz.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8shulctdjs7pf7csi93eqv7l94/nejozizubulagojibum.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/48331289008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lakshmi+full+movie+downloadPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10724 bytes
SHA-256: 5ebf3bec04b188e0d8adeb2b1a58425e564ca2da20e720757aca8de3111faa57
font_01_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 18200 bytes
SHA-256: 30aef2e25b54178d855ba9bc6f91855df74d0fca3a18e1404e49b39dd1030efd