Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c7ccd7674e22b5…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 03:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4bc8bd2e45fa64b74fc0fb46c609d258 SHA-1: 7c2e6ba343c2f9efb5f97271b8f3b00ea6b32f49 SHA-256: e5c7ccd7674e22b511debbec7f04aa406e293e89db70ec9065310db87337cb84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing pages hosted on these diverse domains.

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 https://alnahamgroup.com/userfiles/file/xiremufegabozojuxo.pdf In PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/fidezuxadoga.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ek2j56ar9d713coavu4umhnf2o/63972772745.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e873694abd---rezode.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b1db82f34a10b6994a87867028045859/9716164116.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/u9b493j03uqls3bj0u4l1bs1aj/41458246424.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/mujapagefa.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6040dd4aa7c49995bf5537d4585d5168/26405310172.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/86234872352.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/pv89rj9vcrudpb1ste1nk4snir/28846536770.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/83277509382.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/gl50eupgpc8fts52ijuvce88kl/mevisasetafexuvek.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2661ffff---vemasizakalef.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/zopafitiparamat.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/82719979183.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/57443305904.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/nodozutezigebima.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/40ibvgjselm5dfvq5qqlansm81/64861531562.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0d1f78477d4be502add70aed0104c7e6/selonotopuvelumowo.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/tisesozubuxegixiforipelin.pdfIn PDF document text
    • http://surtek.biz/image/files/20150205_111950.pdfIn PDF document text
    • https://hoalavender.net/upload/files/dorexelizimatazokedivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+is+the+concentration+of+hydronium+ions+affected+when+the+solution+of+acid+is+dilutedPDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 17932 bytes
SHA-256: 6ce894299781fcb5ecdb3de17963c09b798ae97e43156c12fb1ecb7027123bdb
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 11032 bytes
SHA-256: c3c51f2f2742866afbe59b5d5100a28d11fcbe3170d174745ed5d47dc195ac9a
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1