Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e06be5329821c1a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 13:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3072f8f18734b1da816304f85155a96 SHA-1: cd62eb0f604f62e70e029756e5190b09dd585f64 SHA-256: 3e06be5329821c1a83278312c5452cdfe39d9e5eb227c2cf964e935d1d463694
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm, a common tactic for SEO manipulation or distributing malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21b87ac397---15318959282.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gdmhi8e1emt638d0c823sdc95d/29940195827.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f242207db44f2c799e69782615c9d958/temewosobafobabolefovowub.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/sunidevapimeke.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/zujobotimu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/02a3c02db6c37808032d5ae7500f4340/99215992948.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2vqg3iia76nqpr364rh3anv579/74188740671.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2e4fb2b5a08c9e58086910adb9480592/garibilowobok.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210526170353190.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/dixonomomubopel.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sukufow.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/54c6a3aad3afba81368a988478c247c8/62818860408.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/12032461697.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/vemifukivef.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/83984315566.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d05daed575de6c4b1d521b739bd3d1a0/58424058106.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kaxidaxexomazeki.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/jokudulopogabox.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073156ad116c---pitegabufesilapelarutig.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/19118754299.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/18849636768.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d0a8c556---dugunobinonatozos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+chemical+engineering+thermodynamics+pdf+solution+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa14033fef9---68760721232.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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 11232 bytes
SHA-256: 31fcd36ff3d2691d90da2d6fbcd306e044b6aaa2885d5b7fc4b6690d8df1943a
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 20776 bytes
SHA-256: 157518cf82f3caea6685a66a97c3b56fb575f57911ce4a1946e0478ec8374775

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