Malicious PDF — malware analysis report

Static analysis result for SHA-256 27538ce670bf2c9e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97edf7a6930262c737ce40b087661c56 SHA-1: a849306e43dedbdee88feaedf81a9d55ccc49f73 SHA-256: 27538ce670bf2c9ea920a8fc0e0e95399f8e11c231cb34cfd8d840a6aa7ce809
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=vector+calculus+pc+matthews+pdf PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/40686659466.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/aa440b09b0c9d0156230d813da828200/tivivapolevanijetekezagis.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/2305804210.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/baxolazuneximabizo.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/demede.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/kaborataxofuki.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/51lui6lur371nkkkl2ptpmisgc/82680386101.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/82a39dcd5c1a07842d59c7eb6d604b50/83509054732.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/zudibumuved.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/810c6cc59be1089c59949fc88e0b81ea/ropalijubexu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/fuxukebu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-20/20210620111510913686.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/sidoxas.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba81ed0b9---71027191853.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160958c39b8058---vokakirolujituvimalukaxu.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/kaluvebudakokedajotimufax.pdfIn PDF document text
    • https://premiersuli.hu/files/files/67108142519.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e5271bd---sunilipopikigep.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/o43ts9nddc2qqthcjdhsdmruc1/domavafarajodofa.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa059721a9c---34173138238.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/gaxizig.pdfIn PDF document text
    • 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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 10844 bytes
SHA-256: 9396880ae9ba80604eb45097c6fce1be694fba471e5636f8ae53b890f898d943
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 18828 bytes
SHA-256: 1436d9c7933cbe14217334cd9c114cff2a0d2634a8557d0ba9ec997d2dfcd679

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