Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0a2a1eb6768ce9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 13:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7862c2f524fbeca54bfa46c729dbde86 SHA-1: 53bcc840f3802aeb80bbe0d77c1d1ba1007ed24e SHA-256: 1c0a2a1eb6768ce9d608c12bc20e1e91b905350781af08c7882607ac69735317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to distribute malicious content. The presence of these links indicates an attempt to lure users to download further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78d48737f---3917612417.pdf In PDF document text
    • http://mesahighclassof64.com/clients/874441/File/wugedufoxuzopo.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/nobilavapugijaxoj.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/baralota.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/10927762924.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/06b40875fe431a65707e48165c39491d/logukedonowidijarod.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9c119602cb5cec93e2de6df584ec3844/bobofeximulugusunivo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d5e187727421ccf3259961de0bf288da/92096686744.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96a916b05---78086569731.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/77755795347.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/8140795809.pdfIn PDF document text
    • http://iphysiology.ru/upload/55717909312.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mnqfhkijri6fn5vjflaeur3dc0/fezepesivutemad.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/13535937139.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/91808102637.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607405d7d45ae---58090339706.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-24/20210624092432684053.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204daaf21f---sabufamiselup.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/zerusomepixoxiwu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/16174955325.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/4453767685.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/xabunujuxadugebule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=converter+arquivo+kfx+para+pdf+onlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 10860 bytes
SHA-256: a9f1862a8f3c4758f230cfaa87275634d2c00c4b86e27d5b981459f767dfe1f8
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 18500 bytes
SHA-256: 9425ae32519e7aed37b282686aabf613a8f2dabbd809329e7758ebf1b1b43243
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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