Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d4f8ae96733502…

MALICIOUS

PDF

99.1 KB Created: 2021-09-02 14:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74d7e0b00cb950b330b9d93c31b9022a SHA-1: 7d4bb1a0ae26e71781533e772277562064948c0e SHA-256: f9d4f8ae967335027d7003a3b8e1f580a4c047926c7bee7338451848496f5555
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV identified this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary function appears to be directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fbfab2979c641b8896e68c29ba078489/sabokinuzaxapejomamezosew.pdf In PDF document text
    • https://altonika.pro/files/fck/file/333160672.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a82d1201d22---79515256517.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/dofiz.pdfIn PDF document text
    • https://vestol.bg/files/file/23445431143.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/846576a3d96dc6bedaa1ec6da7b402f1/sikiniz.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/lukebamonutakelowu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/346df9522cb6f5849b5dc4f3e04a5e5b/17427730912.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/45953372070.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123dc1608bdd---31040732003.pdfIn PDF document text
    • https://foulardfotografando.it/file/83443792984.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/l41c8qg00f5jh274prglau3vh5/zupiripokukejo.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/junidokidokorosaf.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/46915625001.pdfIn PDF document text
    • https://sambelteri.com/contents//files/sevanajusisikixe.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tuvibufob.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/45201339296.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gopogugipebuxenovubowaw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d4dad4ed3---gimizupudisijum.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/7346194862.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2c93ad7cd7dad3d39a6e49a29bb6bc6/1932296873.pdfIn PDF document text
    • http://jp-cable.com/d/files/45819060363.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/58718659436.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d2603f032d55fb5dd1efbfae672b3006/61796144394.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/22942250707.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vewewejategeliwamoguwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=espejos+esfericos+ejercicios+resueltos+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_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 22432 bytes
SHA-256: 6dba3e0f467e4b7a91adc2706ad377083d12f47ef9dc81d282136ef8ac6aa3ef
font_02_sfnt_off000165b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B2 10560 bytes
SHA-256: 876d78192ee7a5a84cc9443880dd543ad99402847d6b69ecd4de2f4760a62d72

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