Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0b303bfdc3304f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-10 21:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e57a12ea6cbb6406d1daa159687070c SHA-1: c46ed44ec13f4987d0a47b2a5dd2498db9033e1b SHA-256: 9f0b303bfdc3304fc74887858dbf120107ab357819df556e00f7e81cff041091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hzqzg.com/d/files/60939074648.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/65q0sh5qk4c6k5c60vvuu5vvd5/karixonupopezur.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161341ee6cbdd9---30494256378.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/55921999343.pdfIn PDF document text
    • http://hexindechem.com/upload/files/91401706845.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/42060880356.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/mudokubavebajizolobanate.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97df682ec---63350788787.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/83b5ab0bb61e9c15d69a89c9f3a3b0af/gavelabakezetija.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e255a2f0---zalipidufizuvag.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/3958354779.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/29505051995.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/livegutike.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/32251467660.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/92520139898.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2142bf9d---zevixu.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210906073417.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xobijado.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/41479818598.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/dawewoneb.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/43654108196.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfda0d7f---xezuwufagepus.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906060454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rise+kujikawa+social+linkPDF 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_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 17652 bytes
SHA-256: cd11361a80b127788cdb627159d6076b0b421c6c9e95a98302cc48ffb230520e
font_01_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 10476 bytes
SHA-256: 7455a429762a20c7df03fcf6c9af9bbbb860689aff136a2107e0e2e8250db67a
font_02_sfnt_off00013ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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