Malicious PDF — malware analysis report

Static analysis result for SHA-256 df58355d2b45d24b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 02:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb530e743c259b5bf20385ad37d01ed1 SHA-1: 749d87d7ea5c71b10db184492b43dc08b2406c22 SHA-256: df58355d2b45d24bc253e4075d3f7617762b81e8fa7259217132dd15c64b97c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=paleo+grocery+list+pdf PDF link annotation
    • http://suncitygroup.ir/basefile/suncitygroupir/files/xuxugetadivowemivupupo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/67642209974.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/vifezanadogugube.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/58324357504.pdfIn PDF document text
    • https://isleo.com/i_photos/file/41401462129.pdfIn PDF document text
    • https://31app.com/userfiles/file/kujavolenakimujobofix.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc1f2a886---seluwupa.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/galafejoxesimixuwejap.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/90358051066.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/tapizikosikupa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7ef9d0407---tebujonizomepomemepav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6eba7147c---pedumenuxojokedo.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/34726592557.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614140443459f---36371826593.pdfIn PDF document text
    • http://vucert.vn/uploads/files/95404547981.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/bofoko.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/535531018.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161450d7dd12bf---20083270832.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/54058081725.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sogasi.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/welelurepedozudikepim.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/mufogixusesunetigatew.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/waxovaxarasewimir.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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 10804 bytes
SHA-256: 75d59ec230b6923a81034d45bc408b0243f2af2bc72050ffdace57553af3815a
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 17828 bytes
SHA-256: 8c0e816e566aa3cb619c4162da80db555833a7fbb9c2ed52c3c091984edea2c6

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