Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ed05c4b7feb047…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 11:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df521240855ec83fd166712d31023bfb SHA-1: d3df1b109accb38c4d2e8223bd750f5921c41e93 SHA-256: 15ed05c4b7feb047254cc7b0ecf81a5e6165f6f2d1bf9e5c3cd7732e33d19d9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/surapemu.pdf In PDF document text
    • http://alexhoffordphotography.com/temp/files/file/mivuwojuzexewexe.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202152695308498.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/wepemaw.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/13bf06e2bfb548786d2421e55f9128d2/68576124650.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/77777122976.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/tobos.pdfIn PDF document text
    • https://tavio.ru/files/file/45665114093.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699969f6fa---bewetifitasajotonida.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/92028ed61d5fc42eb6d15281107fe323/riwewekajogif.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/95199142467.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66f4119a4---tifopuzalodujo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kenelevavazilokot.pdfIn PDF document text
    • http://absigorta.come/file/xigubifidam.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2b49dfe7---jomumivosufatalakokugo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f4c54052d2a66dd022e95b02b8fa6f33/bulijetasutifibizakatowew.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1c1f3ed0---11540326249.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h9vghccl4809l1uavn71ve284g/6887941263.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/79839242086.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21886188552.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160791c9c6f921---90164383048.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/81549774591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cymbal+sound+crosswordPDF 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_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 17804 bytes
SHA-256: c62cfaa0d485ae0d64967ac9e3b975acd28eb558de8c8e5fc3486b55e25c721e
font_01_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 10680 bytes
SHA-256: 527b5414321ffc35cad58e759726429b56668838f153472e7413b3ab4f57f87f

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