Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e0a08f9fa09c2e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 06:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f42bba451cd7514ca0195a06de164fb1 SHA-1: 1170110e4b587772e9d60d571159f59fb9e6dad7 SHA-256: 05e0a08f9fa09c2ebcc141f15fa504419ed98d2f5b88fd629665b11ba66b6b3f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://csp-pub.com/stockages/files/tivilajimi.pdf In PDF document text
    • https://kawanmto.net/contents/files/novunisenolupodarudozopi.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/34391766961.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/80009930153.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/tumimamelumev.pdfIn PDF document text
    • https://renetravel.ro/images/files/53407515583.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/fuvefajale.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/90624855722.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecacf2790205237d11b1b5b79d42fcb8/81002996665.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/25966359031.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/227619951.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/434302701.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zirofozewujusuzodozozumo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/65490307092.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/vuferofefubemerekoraxude.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/nijufazopugenekubabed.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ea5db1b27---85812030900.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/60226194632.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/pafebukuraromodekaxobele.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/turapabemelebamufutotozuj.pdfIn PDF document text
    • http://sakem.org/userfiles/files/66986568489.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde272c1a8e---23539477371.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/59153476494.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/junofejojet.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/rugojotojoselen.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa1dcb4bb---fagavute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=emanuele+taglietti+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_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 10536 bytes
SHA-256: f4dd36c8528eeee772a01ae1dc756bdb77a9d557fd85f0155b0be90420a84c13
font_02_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 17868 bytes
SHA-256: 450037d5e531535592ad5b7b658abbe25f6a296bdab04f4e9745bba7834eafcd