Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb9c9dfc643cf19…

MALICIOUS

PDF

84.4 KB Created: 2021-08-16 02:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 07ecea7aa25b8f8ca4213874779f6c96 SHA-1: 743eba545b1d84dcd81a9e2829f98b3f6e8368e0 SHA-256: 9cb9c9dfc643cf19b82f515f4772bcd9a208e1a0feb5783baa2b0135afebbe66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm pointing to compromised CMS upload storage and disposable hosting suggests an attempt to lure users to malicious content. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/1053014960.pdf In PDF document text
    • http://kinel-hunter.ru/upfiles/file/2965985938.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/30753836926.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7jo2baeebjnl420kk5bslfqrmu/zepat.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160798ddc9cd07---sezawejutotot.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7739c2f398---327801629.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/21335904963.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/xesafakuwinuxosi.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/3799393271.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/179cbcf791020f32e954414e59de3c0c/xetomifakitijakiwikiwo.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/ponapitakesarajudoz.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/55900363058.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/13313043141.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de3651c71---gojonexajobit.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/83944489664.pdfIn PDF document text
    • https://sealskinz.ru/files/file/11457736056.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/gavefa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818513046d6---kewezivanojanovobunewim.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ebcd27b331d83cb0ba7b6ec7c30d0686/fozetuteruted.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d06ebe49---97317413539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=parrot+bebop+2+skycontroller+setupPDF 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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 17604 bytes
SHA-256: 66267484171798e57d4a2275e81fcd56c5f0522baef2edf0d796f223edd679ec
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 10844 bytes
SHA-256: e5cdb2b561193911e321169b95586f431fe9d0cabd203d7aa73c7ddd5e617417
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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