Malicious PDF — malware analysis report

Static analysis result for SHA-256 6234efe57389c066…

MALICIOUS

PDF

87.1 KB Created: 2021-09-22 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fb5bb18d6e2f74acc4dd11c2b2512af SHA-1: 2f0cd980b565cd9df37075128fb984d34df3950b SHA-256: 6234efe57389c066b992be473b2a81613c1d0b40c8c25c52c9cea87297da9d4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=open+my+icloud+bypass+tool', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=open+my+icloud+bypass+tool PDF link annotation
    • http://surmounttravel.com/userfiles/files/89116048905.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wovoweruletizumiporu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/guwarerusosazafolujakut.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/pipolamezizegu.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/jabadokemefojubogamigoki.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/36137805348.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/15923788831.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/62464484039.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/39253740326.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/bexasakiviwagunuzeta.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/doxoxabubagusumawopaz.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/sajumaxojatesaxodirana.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/79324092085.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/nojalaxokiwemamope.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2cd8879b44ad1854eaf9dec5652001bf/89390837005.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed2d58955c9123e4fa94629d84edaa5c/mutemowagobetepo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/meegqntrh2q3agm54bg735v1t3/lirawibozuz.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/66606665852.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/340231f54259d1b859deea7bd6bb8fd5/56254658808.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/lolopewewoterasowulurux.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403f480ca58---90652903560.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021092214325573499.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161318df726505---dupasigezezizopa.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/43140913747.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/suwadojaponugogalawobo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386742b1dbb---mifovog.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/tupomotowazisaw.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/95821943896.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10956 bytes
SHA-256: 949230096f415fa62b4a9b2da34555539e8a69667e4ddd486c0ef1160c7298e4
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 18376 bytes
SHA-256: e81027ac1c04fbb061d22b4d63f711896a0b9842422d07fa23303e8fdbdeae4b