Malicious PDF — malware analysis report

Static analysis result for SHA-256 c452a8781e03eb7a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 06:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c744d0eee2dc7f4cdf595458eae96c1 SHA-1: 257ca7097d8820917d1602a7b61565b9e02d161b SHA-256: c452a8781e03eb7a258b339c09723683ff00058ef0607c64c7c35276a95baf95
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or other nefarious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a134f3332b9---rixag.pdf In PDF document text
    • http://drapa-technika.cz/UserFiles/File/71442035551.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c672360e657---13647068506.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076edd92b11e---92221563152.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/zesosefizepoxuwepemor.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/71541186523.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/wukazedak.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/45204022243.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/98005417593.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df44955368---20639901522.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kivkmsijq154lk8nmg0igie9v1/meleseti.pdfIn PDF document text
    • http://lulanjina.net/upload/files/28302447978.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/72905485943.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/53582754708.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/90322473477.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/eacac762258d5a128a8a10c66e9b4b25/venasuzizirizu.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11672474304.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/23502750067.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a491759e---45395605364.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb54ac0df---39377662558.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/luduxoromugusol.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608499f9f2cce---zejurepukigite.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db746b508d2---29377350652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+birthday+wishes+for+dad+from+sonPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eea60e9d99---bepigififipudebawixigogo.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_off0000c4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 16504 bytes
SHA-256: d26579921769b87d986321fbbab629900a9ce069c687f17c014fc4ad9333a870
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 10968 bytes
SHA-256: bd7ca9d86067b03141b6a3251452ee9bfcee5f41c766917f9690d16a547e9c21
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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