Malicious PDF — malware analysis report

Static analysis result for SHA-256 864fb75d9738a7c1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 20:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8ef0f8c13f97ea85d0a7dd2f51990560 SHA-1: 2d4b33ea32dd46d28ffcd23af7ef548aff23652b SHA-256: 864fb75d9738a7c1a212ad119b72d7749ee067a1dec63aa1c9acb1fc13b20915
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The file contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

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 https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/526b45d258e10afacdce344f96f738f9/42885968762.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/14795434681.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96cff28f6---36596193712.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/abb60c37c384a474117177e78bfd78ad/2342249047.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0b6dd2dbe26667d7b11e6f2867503cdd/tadeworekazokuwi.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/jujusijigeg.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c148d1279e886e6bab028d82115c1971/74143015859.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7deee56a988f19a2c3f4da382c1a3a6a/rewasujodib.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1610d37fe20820---xasodi.pdfIn PDF document text
    • https://clove7.com/userfiles/file/86390476717.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210717051921784698h87ws.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8tvlktdl6t8p2358202koi8j8t/tonafuva.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/67226113117.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/gibifipipo.pdfIn PDF document text
    • http://contextuae.com/resimler/files/552215708.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/julalobapedisakebokosuwik.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/55604293395.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612de021e4b6c---nuxevapigikud.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610afdfa7b080---34194339409.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/be79e2814d5d31d792184e85c5616d67/jewogud.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4183f5a20ba86707b94db21723a59cfe/fudetagemiwixax.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/82396775957.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/sinizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tremolo+guitarra+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_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 10632 bytes
SHA-256: 2d32dd78edde679cb0d10e0d57bfdb138d0a875dec1f0312a3bff4d99f9c48cb
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 19356 bytes
SHA-256: 2ed5115ffad6c0144fc82722c3033718eafaaa8f9a51cb62bafb301a80e60337

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