Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f93aff8acd8374…

MALICIOUS

PDF

134.3 KB Created: 2021-09-08 00:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b1331e9fdb003ab21f6e30a25024b72 SHA-1: 536711d951643ae011e7f9ad529d509e8e8f980b SHA-256: b5f93aff8acd837444dfb6e2abb058e917245cd46abb0453aff621554c501fee
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or leading users to phishing sites. No scripts were extracted, but the structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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 https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f2adc4ab6---nebiponowonu.pdf In PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/10639761182.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094686d8f0ee---pokinakajiforarewito.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f404c34---meripozuzagasa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094903b53681---15404473896.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808199c7ca3---84889850014.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608631eb24edf---16400246513.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/gesorixitumurimapazu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb56d8d61---8498382265.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ba5974e9d4e3a5c9e10163269903ff5/27725867176.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/37882971748.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lovobumafekelapigegaxeja.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/33791083301.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/96904221507.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/13548554848.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wilokopamurufurij.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/udm0kt5kefe2apgp1th2b4cj74/26808314192.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/mivirazopovarer.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/dafodusumemidukowu.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/40576113793.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/ganubudopepotut.pdfIn PDF document text
    • http://coumert.com/images/file/76675023042.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/marisutenimigeresugele.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vibalitimejexawedi.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e9e8fcc8b5989edc2490842b1f84393d/tudebuxutuzixebuzewusulop.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dafejobe.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/97915642713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tafsir+du+coran+en+fran%C3%A7ais+pdfPDF 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_off000196e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E3 10732 bytes
SHA-256: 6c28e4fa6aa05aec59f3655a5da42849721de54428c42bcd50f42acc139bb7da
font_01_sfnt_off0001af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF50 27128 bytes
SHA-256: eaf4e806c3ac2854e73dffaa535a454769c4c13a42e7149f8fc5c8c716650079
font_02_sfnt_off0001f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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