Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0ad0ed8a8d8432…

MALICIOUS

PDF

85.3 KB Created: 2021-07-26 12:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12a6c8f2f842b1dab99f156cf3fe6088 SHA-1: 92fc0aecd8279cba8788e2a56c1b635ca4c3c5b8 SHA-256: 2c0ad0ed8a8d8432253ec17c6a5e6038cdb8fedcb1ed0fa528491178644bf415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to external content, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea28fb325b---86889206898.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d3dfd32e6f58784eaa89d6f7a8e2d40c/gubasudubomigifijuzafer.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/femik.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd892ec125b---63283198209.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/84d34e31f85f360b754fb48463bc36eb/bipiko.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1115cc30---93380717251.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/8elr2gholc6kq9d4agdakdr390/18945233519.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i48ohkdo6kdutu5m8h4tm2dv46/jegexisuxo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/52205601919.pdfIn PDF document text
    • https://tempegaring.com/contents//files/busuwifemepizizuteg.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/92616039f602488e592e744041d5d5ca/21990478851.pdfIn PDF document text
    • http://candientuvibra.com/images/file/vinajela.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca7bf3873---sigaxanipadedo.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/jidugupuzinevokafima.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/fukekizipukag.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l2bhgd0escr65d70hmf6o2gckh/rilot.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ubhlalprnr415mtko43t0eo20u/57365949435.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/bavofarurukonaruz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db14055d04---70950715886.pdfIn PDF document text
    • https://tangentemag.com/img/file/8367009050.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/fisinunomanenobejak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5af153d35---zunuzobu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f2af222bf---zazasevodijuwegof.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/22534008118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=como+se+hace+un+interlineado+de+1.5+en+wordPDF 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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 11104 bytes
SHA-256: 8a1125df9cd0b361ec404091c9b07ad57b069ebf08e19e133f9e28b421e659c6
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 17348 bytes
SHA-256: 4d4cff5b83261dba2e73692c5661939473670f9598bbeef1b795b3227bd3c314

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