Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec353ddc31878c7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 07:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7af9cded55d2e65bb64d82f588ad6a5d SHA-1: 6d6aa982cc00e5ad568d9ad0024417227d610bed SHA-256: eec353ddc31878c77be687fd30a8bf7f96aa14f9aca06f2feb4d5677c61d0b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=convertir+pdf+a+jpg+small PDF link annotation
    • http://premsaktidal.in/userfiles/file/foxepapozabubis.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/14702054817.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8f964fb---bovor.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nobuxokegoxedezabu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/kosekefob.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219325383487.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4c7a4c8f0ab0c2e4112b8eae94110e54/xomuzurapuvowarupivemam.pdfIn PDF document text
    • http://arslanemlak.com/E/file/sejove.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/32137234878.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/22642625895.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rqhv5nbe21c8u5l448sbmv1obk/84841508657.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a7805261---makivaladomerojujupanafi.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/kanixitolezej.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a75306b0a6b---60208121385.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/pexudax.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c9305e9f1077168f51c39c12bc761696/zorigagogenasadunatoxade.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210617_AD509D21CCFE5C02.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/80679244228.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nutiwebawusunufatuf.pdfIn PDF document text
    • http://twtime.com/uploads//files/202108030247432474.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57425508906.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d7bf0aea---26600581035.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///bidupebenubeluwujiwexuwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974587bad14---wovorogipevabufoxuxake.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081226665f41---47966609209.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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 16864 bytes
SHA-256: 783ddcbe17fb5a9632172b8cd516c20c53008ecd673361b54376330063dcf7c9
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11068 bytes
SHA-256: 39811596dbd4f194cc5b4f8ed57532d0cbce1ce9152ff99e0b84bb326cf4c44d
font_02_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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