Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5feb132719f81a…

MALICIOUS

PDF

81.8 KB Created: 2021-07-03 03:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c31e5aa0a07358cc89588783c237f56 SHA-1: b75dc294ee3bea848f84b11b5563da1b56302a4c SHA-256: ae5feb132719f81a60b345268bf2423f32863ad7251d64832aeaef0928f7c89a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple compromised CMS upload links indicates a pattern of using vulnerable web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebd519cac---safis.pdf In PDF document text
    • http://gernano.eu/gfx/userfiles/files/vamesumetuxorekevovew.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6853b38d6---41288819656.pdfIn PDF document text
    • http://robbes.nl/media/files/7756683130.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gemovalobaladevemo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/29b4be46053d4c4643bce904f7e07ec7/miroxoduzokexiwamowegew.pdfIn PDF document text
    • https://proxus.nl/file/59158087816.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/583316e2243561c672a64d71422d51ae/87019508227.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b8c5d6b4ca081a453ca734e5e9708b7a/dadawinurasesarad.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ac8afd36525503d65295e10700d5a63d/68178307992.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8v7np7k6nd2n17d3rvvsduhjuq/gawumumipezepu.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/pemozi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/45880852645.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088a2c6b6ccc---43895786714.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a59840e6---dozozino.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7344399f---zuzezataxenew.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095aedaea784---reregejadazixuka.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/xoxofurulugewevob.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/424896c197d724889eaca2e3c4c2b9f5/29643939920.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/95788333567.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/629b68fe31291245daba40c4fa8f068b/zudazekujipot.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/dexusisigojubupaziwo.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/98979898114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ailee+i+will+always+love+youPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10144 bytes
SHA-256: 3243ce25075d99b47e80fc3e0c4648b23593a7eb11ac129965f071ed9025b0cd
font_03_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 18004 bytes
SHA-256: ff4f8a76422213689123f289aeb43857f18674655d6d5b8b83e571910d1bceca

Open this report in the interactive analyzer, or submit your own file for analysis.