Malicious PDF — malware analysis report

Static analysis result for SHA-256 0baf484c7bae7dc5…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 09:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 933906b34f6026a56a69051d4b9317ca SHA-1: 251c2a17a6c70d8a2b683939bbb1e884f45a2597 SHA-256: 0baf484c7bae7dc58ad090f168971f0893642be1040cdea3fa2fcab512eb6960
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://docando.es/js/ckfinder/userfiles/files/84546466829.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e8c4cb5ed---54010611502.pdfIn PDF document text
    • http://iphysiology.ru/upload/futerakumemujibodixax.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/3711c2ca0eb1e78b85ea33cc59d36e04/7163801381.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zedipalevabasojugezi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b66d2f0c---88341326375.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/xebiron.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/gokuvowajofedovudeda.pdfIn PDF document text
    • https://computerzone.pk/file/77320891091.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e979lf3olkse7j46cv6cb31kpu/zekudelanukusumosaxa.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/52704306492.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/pugodukaguvapiteto.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cf15429e11c39e1918fdc59ed8711e9c/7710029034.pdfIn PDF document text
    • http://alkanboya.com/files/file///sifapimufosevadalevovibov.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c12f67eb9---figonufasavasa.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fff7661e---lipodokefubejowetoke.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-14/20210514071127933686.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bbb699a56ab348e08b8571e7d3101dd5/pimebajeku.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f3d5a3f0bc70f10dddfccb52e0e80d0a/falinutopasulamavujetibag.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/edodgtkshhn75onv5chi2jv15u/vilasepekigenewufekig.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5urqh1fst7fjuf9vtqk79pnjv5/32853475061.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b169774e---takokanev.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/dogomevidago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sananda+magazine+pdf+2018+free+downloadPDF 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 11296 bytes
SHA-256: cc7a58f19dc0d0a0c6d31e5760dce88c7f296ef5f693dfce67ea8275f1fb406f
font_02_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 19312 bytes
SHA-256: 9a9b37176461290809d85b462b211edeaaddd75f7854b0ef1173d3cd7f3f49fe

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