Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d375e27602ee5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 14:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cad1281826bb50fe48ff54ac508adf07 SHA-1: 7af39fbc46328778c5510e48d8c41979d51fdd61 SHA-256: cc3d375e27602ee54210cdabc8092e2b71881c9d9ead2317ee9267cb2498c315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, directing users to various domains, including compromised CMS uploads and disposable hosting, with SEO-optimized terms like 'icloud unlock deluxe free download'. The embedded URLs suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=icloud+unlock+deluxe+free+download+for+windows PDF link annotation
    • http://s-privod.ru/userfiles/file/38133988614.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/59520587596.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfbdd81a65---67900939485.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/75835538094.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ij3j1fooikm46to4ijfsgqfi23/5241767167.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/51691725269.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bolexikozuvafeto.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53323258656.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/pazatimavaw.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1lfihvik9vmv9l7ko7u4mim44/razisanemis.pdfIn PDF document text
    • http://gnox.vn/upload/files/dorapixikegirajewa.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/vimanebewitadapuvenu.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dobatisufubes.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/62743451008.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb9513b82---muwikosogibuselupaxuxusin.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/67837298085.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sewujejogudomugosexu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9759905b---98614243840.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/donevejokuvowoxofoxo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313eb013fc7---nokevakik.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/76887755023.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909052611.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109041335537105.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143be755a773---tomitafumam.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16740 bytes
SHA-256: c2c06208fb284b017fefcc8a62b25187ffcaf1ca2cf3b3011d69ebe9cc832af4
font_01_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 10704 bytes
SHA-256: 08892d8ed1ba2c72ba59517ddbfba5fe6f018de1fa92aee8b562e92790cfd853
font_02_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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