Malicious PDF — malware analysis report

Static analysis result for SHA-256 0081b6cda1c04ebf…

MALICIOUS

PDF

77.2 KB Created: 2021-10-10 21:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 667dc1dbe2c8fc0ed70d7cd112309812 SHA-1: 0d89f9ff8c3d41ecea5fefc24c78b8d2c78fd41c SHA-256: 0081b6cda1c04ebfb4e7b22c0d8c51dffccb30d73fcb1a1542037b6bb47b0fda
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://abnicum.ru/files/file/85626801716.pdf In PDF document text
    • http://cablexconsulting.com/Upload/file/62389796850.pdfIn PDF document text
    • https://plasy.com/uploads/file/seludetaserawidubo.pdfIn PDF document text
    • http://yachts-trade.com/files/52611882764.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/25126737035.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f15f170---9280028648.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qj9vjno2idhq6ncqi7o1m89aj8/betubezaboxok.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dokirevibune.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/buwofosekepibezivomu.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/8711698862.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/bunubonebujivasuk.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/rixukuk.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/66869139744.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/37375506294.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/batebifor.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenilexikobofe.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ec7bb8909---62965029059.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/kajuwevo.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/nakakujevebiruz.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/77800719430.pdfIn PDF document text
    • http://evola.it/userfiles/files/90597483714.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/sidewurupegosisopi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/72850883179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=i+know+him+so+well+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_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 10532 bytes
SHA-256: ffae670cf496978f5fba715d2c96da3c1c9a6d134a46df457ea134879477eee7
font_02_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 18620 bytes
SHA-256: 83088c73187101cee5e42a01d86120b40aaee7071b6895415665de337547d9ab