Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cd8ef2cabd6521…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 12:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ac9571d2db1da3b403106e611f3bacb SHA-1: 6bf29cadcc46e4dd2bc6135322444ac9cb26de65 SHA-256: 48cd8ef2cabd6521b9b4856fdc463063b01ebc36d2e6d5e24b8a5d749955a083
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, with numerous embedded URLs directing to potentially compromised or disposable hosting sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lifesmart.ro/ckfinder/userfiles/files/kugivo.pdf In PDF document text
    • http://nwhouse.ru/uploads/file/wananexepuwukikepukinubu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/8023983261.pdfIn PDF document text
    • http://sbmhavacilik.com/userfiles/file/kemunetawoxesuwojuko.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/77378531092.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/25231898139.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/79187970366.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/pubofagapotodakowegej.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/roteputejegelelunixu.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/rovagebovizanev.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/nevigapefujasinirakikowo.pdfIn PDF document text
    • http://lblussana.it/images/file/94534998164.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jfdmj95smgg27h2pp9vu6nspja/43488846790.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/71384646613.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/79364263219.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/gopesun.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/29047600716.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/warozagolategabezanexexe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613723df26635---50109648143.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/dewuju.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eff297f26---domuwapuxekeradikute.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/jaxedebupefoxelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=france+in+revolution+dylan+rees+pdfPDF 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_off0000ba5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 10868 bytes
SHA-256: 00fb02957076dc7afb7254a7b1a1f608248ff5486656d6b81a6b9525fb9ee72a
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 17048 bytes
SHA-256: b49789996e857fa8e212ab5ffa08aedbf3612a06472b09b310122d4f7b60720f
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1