Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a47bd8dcd298580…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 23:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5799d57af455f8b5acc442d09983cb8a SHA-1: e0020f33c40c218aa0e6833575e9a7f5328e72ff SHA-256: 3a47bd8dcd2985801ce96b265b3d460745d4ec2aa9b4e4985bcd23f210a860e9
224 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document employs a social engineering lure, specifically a 'Browser Install Lure', to trick users into downloading a file. It contains numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary goal appears to be facilitating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=tv+portal+apk PDF link annotation
    • http://murzilka.biz/images/uploads/file/falazaxubi.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/95791233728.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/lijagugofiwezumagiw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7f5a96kc268m7kidg1mr43pba3/4293137872.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/ragakatobasujuw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f994719ef3---73445193140.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/zafuzepexa.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/96388761165.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/4067284982.pdfIn PDF document text
    • http://krupongs.com/images/file/lavobipa.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/mejuz.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/9391968004.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210913_051115.pdfPDF link annotation
    • http://rustproofingottawa.com/userfiles/file/23621476650.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/94288483698.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/81379393111.pdfIn PDF document text
    • http://fedime.org/imagenes/demejufobedikofepure.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401bef46219---98609399471.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/76097543140.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/26554768526.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/renegekegadad.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/gukawo.pdfIn PDF document text
    • 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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 9868 bytes
SHA-256: 517d613d0d1c22e378f989f96740e6a57e27dce07e37e13082c22646291d8e1e
font_02_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 17508 bytes
SHA-256: acb6ede659b9861550727167acc7b516bfe431087788bc3b1359e07db07aab93

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