Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41af2e493e7e2ec…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 21:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82943b6021285b64173928f7886609ee SHA-1: 72b698be5a178da7e2a4341a2a092e2421d9208e SHA-256: f41af2e493e7e2ec3732d5bc41cf31df68e3dab6511b71f6d3c1d84c4f68f87f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://congtyvima.com/images/Download/nubonijekujadefopelazumo.pdf In PDF document text
    • http://alacartedesign.de/userfiles/file/gaxuf.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/29230669546.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/56584894547.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/dawonowivagofofofapu.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wujisepisafegediwifav.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kujidubijovafelowi.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/gekeve.pdfIn PDF document text
    • http://darstin.com/userfiles/files/losurikulunanekajetizod.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/jozuredamex.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/64496911655.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f2b4553f53997239166d344abbc3fa1d/petotovum.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a439d4d0a24---67067321241.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/luelu01vd2nvpp0l832ropre7l/97328653963.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/94273050891.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de5dd08a2d1---fexarirudugixubovij.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/pejopewejijuruki.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3f831c1e---20319322797.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/lujaron.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/laduxefebaxunitigigefok.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd5895d81---16079332990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=land+rover+90+110+defender+workshop+manual+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_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 11216 bytes
SHA-256: debd35a7d466216c25f719006b6637a1f1d703e45e85e1cdaa64228054235ab7
font_02_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 16752 bytes
SHA-256: 838f8a1b96b9e3302d0b0ec5341612084b549f90a7920e49de65e71ac7702f84

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