Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb9754e00a82159…

MALICIOUS

PDF

73.7 KB Created: 2021-09-30 21:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf946c412e2fc4b867cdd02725ca3678 SHA-1: 3ca286371aeb9446bae6df133c03a08df27a0177 SHA-256: 2bb9754e00a82159cf5b1ee2d914c0554d2b47032fad02e876dc06945f505c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=cinema+hd+download+firestick PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141287864f21---6252285812.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/dabiluzazoribetatexaraw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bnscrorpppgcje22big4n3k6b6/40235265287.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/114tv8qiss67ukf1vkuu1euehn/76882786229.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/92450804760.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/84878298124.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/kunezekusudafefegife.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/48907982496.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/jakijafarisa.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/28537175286.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/78096372926.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/14606396748.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tokoxiwiv.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kogexuduna.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/pudenoje.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/86397552528.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/ludafidigifejopumefisa.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/pudisuvavumi.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xuririxixepokowemot.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161538eee5eee4---1391041143.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316db5f7e5---lujexewijasejojafo.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/41007942596.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pibivedex.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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 19280 bytes
SHA-256: b5918ab97d5e4dae5071fb774530b74d6aedf5e5a2afa2e3aadc47bdf06e11a9
font_01_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 10948 bytes
SHA-256: c41cd73bed90fefb76d8d47cc092e54499be3113f3f86090d15bf46af4260b99
font_02_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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