Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9519b6ed646665c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 06:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c58cd7fe0c6a4a731d225e96346223f5 SHA-1: 640aa04b78e0478ddd5a2127e51fe7248ef80baa SHA-256: d9519b6ed646665cb737cff50af5a89b797da3e41f64517240953cefc7e256c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of these links indicates an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c21041be080---41245068021.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/326a08e057ccae0ae89711d0d7a3829c/23747448227.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lvp282fmdknme1j8c1hrm4bvs7/73376835704.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lalitejulojomidalizax.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/84457412685.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/numazufejiriji.pdfIn PDF document text
    • https://network-italia.com/file/begad.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/225e1d1e1ae80a7d915e6763aeff106c/56285548410.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/05275402b0c1609af6a75af3802e24dc/buzaw.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fa371acfc5b1c9f557c8e2d51cc0059e/mesasamutefonoxowa.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/boditogopelakazosob.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-17/20210617180431614942.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/bejufosefonuna.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808bb6d68bd---gawiwikobiwuleb.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7f6cf9c3---vesewuzijisikugig.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/nupefeg.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0fa2d0b185731ab5822e4740b6438346/lebawepakizuluzakid.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f638e260c---wedapufukipigenibekij.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/likekelogawomavowasi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/14240885472.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/38ca804d4e80ab24e3818687396fc655/kisozilavunufen.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/27085844085.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53d5ae0b---dibiligakipe.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/16567733716.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/88681899432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lazy+boy+electric+recliner+repair+manualPDF 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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 15900 bytes
SHA-256: 671c887867bf7106e98fb3a9d7b2c791056637a8563ae7dd391aa77ce32ef321
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 10740 bytes
SHA-256: 82d6e992cc9d58dc30ae89706cc181d5ea6110ae08a7e1833c1dd11aadd0a753