Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ce54dcf5130c46…

MALICIOUS

PDF

82.2 KB Created: 2021-07-30 16:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: a3ae91f9e6c971db5cf84361955a87d7 SHA-1: 9fcc39c1d02b2e9e7961fccc1a6f721eb29cd96f SHA-256: 02ce54dcf5130c468724e6bc5c5d0a4a7b556c8dd68d21016a5e9950879cc660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7fdd7a2c2e3467f7c3935dee517d83fb/rotuvorolabuvaguremikef.pdf In PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/3157196963.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/tajeximuje.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/17058084352.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/kubebamesuwigatepokus.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49da0e148---finibikog.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/28795457181.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/52121537167.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a5ac384b---55748836655.pdfIn PDF document text
    • http://3will.org/soubory/files/girexoxijunon.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/69807364070.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91590c051---77897561101.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c6bae73c---dudixojifagiribuz.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p98pvgagrv87m01eo4v6rkorj2/19974197898.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/mutilubalejofijajizewalet.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085edfd20bef---tasazuwu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160982f05487fd---19745511033.pdfIn PDF document text
    • http://babamoleskine.com/files/file/86643533215.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e6f8b44de---tukimumipilukosupeb.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/64087574440.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/900b6f35e4c6b9ef44dea101eae99c8f/65013905441.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kazukoxeruvolazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=libros+para+colorear+e+imprimir+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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 10676 bytes
SHA-256: bd81984f09550e6d3af5c584206482828f7b79bbe422a7d29cbc55dad9f61e30
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17868 bytes
SHA-256: 262142df3445a7c2b23e35e21db3dc7b43e0121e62fa41f11537243a5ee4bda2
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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