Malicious PDF — malware analysis report

Static analysis result for SHA-256 592abdf7e60704e6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 21:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eeda7ddd77efe82d58fd2e0c260c98b4 SHA-1: a299eab156859c6dc0616333421c19fc4984acc8 SHA-256: 592abdf7e60704e6b181405398e53162062ddf9b0fc6327b4f0f331955d7c364
216 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites, and employs a social engineering lure to install a browser extension or update. This suggests an attempt to compromise the user's system or steal credentials through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://burmeseburmilla-allevamento.com/userfiles/files/kabojulezavukopefu.pdf In PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/vaketoza.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/buxaf.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sobonelinalamelezozu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/61578530982.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/94163038726.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/85574425041.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/90145931242.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/soxagafibinereka.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tixapazaromekadodetoji.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3748bb23---63246202984.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/romafuxuzu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/wudumibobexizivotiso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c028e1e5---15449308244.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/88596523551.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gvhp44ankn5rhkkq80hhed731a/11454995176.pdfIn PDF document text
    • http://bg104558.agchost.com/userfiles/files/zasetixamipewula.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/sinerunitidedal.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/19965782588.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/66591036980.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/gefipakoforibu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cff233eea92---fuxilazujawaxomunivur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=converter+png+to+pdf+en+lignePDF 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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 19524 bytes
SHA-256: b945b470b106f62c90fb3c124baf917cb05e2aa0c6d94c355a7f665b7c69377d
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10440 bytes
SHA-256: ef2142ae4be853281d644817a4f7f215f62810ada166a06939b86e64d8820663
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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