Malicious PDF — malware analysis report

Static analysis result for SHA-256 555730fa8e01798f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 22:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fff77863a676d3002dd864ef523d8a4 SHA-1: 5c79c33911208e8826888f897e4a56a0283cd5d9 SHA-256: 555730fa8e01798fcddb73e776fac2d8314785578d080a8049723caf80f86f73
156 Risk Score

Malware Insights

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

This 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 compromised or disposable hosting domains, likely intended to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://stroisvias.ru/userfiles/file/debifabuvigemimovib.pdf In PDF document text
    • http://zaintik.org/files/galeria/files/xuzesemus.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ml6t865mle0a6n3e48oft1eo94/dejabotunowumufuxove.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f72c9873d---56093243330.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210626_31C5AE5F0DCEB245.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/da257e3494bf1c3ffc35825754d043e6/36236934281.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda16ad93f---jatusebigoxaxijil.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/21108896541.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160989c34ebaac---80206563584.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9faa68f26f65db94145a0053d209df58/62819818456.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/17989342855.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vnt32vs0qc5krn4s6mrc92beq3/93282431039.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/nirojegomebodagovavovubol.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/90496599842.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c45c5e4e2b7466813b27f22ba3ec6d88/wozopis.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gupejifugokulavirev.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/49810779100.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/75463376704.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/koduzakaviwutulizetusi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16100c455e313e---10690767803.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b830ef85---gomumituzibigitobirasuba.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/rapusuvijukotokelajuba.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/23nb0j90t3qn7d7e4kkqlksc1f/85761808967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=promotion+decisions+in+marketing+pdfPDF 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_off0000c447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 16868 bytes
SHA-256: 59738b3813b44da70b958d36e192c912441032dd82d140ce6a35b39a1e605171
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 11012 bytes
SHA-256: 2c66516a66b9bddb65f2d7549a5da1ef078d3dfffe2ad65d22dde0fe963619f6

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