Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c1937fbfe5ff3d…

MALICIOUS

PDF

84.6 KB Created: 2021-10-19 06:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2db176cd999c95ac9d2e8560b83f8e3 SHA-1: 7685d2830167b65bc5ab0b7442d9b8fd40163ff7 SHA-256: e5c1937fbfe5ff3d922c0da85400423f3b8f68f1fbe9c03bc856b444045baf34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://riverside-plaza.com/upload/userfile/files/28275672032.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161636a080b4bd---kodivuner.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nosiburolusirotuwex.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1f771ba78b0b57520f84a54958c71528/godawa.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/bidofavumemuvaxoloxowexa.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/82935656344.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/98107634703.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/wanofitesalanibakibumajex.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4ph3a3fi3asnksce7rsrkj46e/zanogubiwevibosaz.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/xibidizujawobo.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/59228982856.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zabikukorilaxoxowamekad.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/gulifexiwegofeberak.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/suzadafi.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906032322.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e310a013a---suzodalavavipipajufoj.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/defijul.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/kepefobewo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4e855c42---zitidubov.pdfIn PDF document text
    • http://cecev.com/stockages/files/pipidew.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53335c8d3---73267410038.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/jidiba.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=como+eliminar+las+cucarachas+en+forma+naturalPDF 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_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 19028 bytes
SHA-256: 8dcdf32fd807a7cfa70d99db5570f48edd7cf0a03e7c46e101e13397f304570d
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10732 bytes
SHA-256: fa1e81765e5f0809e01e7c33986aed01a2e63e334ba7092b57726e16f1574ce4
font_02_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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