Malicious PDF — malware analysis report

Static analysis result for SHA-256 5850b697e3dc73e6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 12:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbc1996cde12717c740605d185463126 SHA-1: 733da3ffe626c56feb5e4c7e3a157cb556960557 SHA-256: 5850b697e3dc73e608fa16fe352ee99ef744ac22e5ebfc962877de4bd8943f00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=the+croods+a+new+age+watch+online PDF link annotation
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/39985480332.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52be147dc---34408357872.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/2721599947.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/rivunatuviwemiguzu.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/48929140192.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/boxeguvewo.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/lawexuzebikowulupenijo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/motuju.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840b1335f7---menebelezusitig.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/jopelavulabiwatoxulagevi.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/83852707362.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/32081409249.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vaxofuronekerajumibel.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lejeratikom.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614093351ef2a---duretidowibof.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/33340895239.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/16183374883.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/zatisizewowejakajek.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/norejipakemonak.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/derupelewemakizesa.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/wojukadome.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/62722721219.pdfIn PDF document text
    • http://bankerz.in/qpic/files/18441484872.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910140612021.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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 17844 bytes
SHA-256: 08a89053f98d9685f180be6a5c1ac5e6c8286f9cde3c021e69ee2f69f32d8f06
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 10696 bytes
SHA-256: 44d635478d78d434f20d8392dd890ce68bc9eab291ceab2bbf38d3fcd83286c8

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