Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20525948cc1f2f6…

MALICIOUS

PDF

74.8 KB Created: 2021-10-21 03:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a312de29c5dfd6638bd39fd7e442718 SHA-1: d5664c5bc24fc5710ead0a7b2d1a7ec3fc20746f SHA-256: e20525948cc1f2f63965775c9ba7d3ad97ec03fa0dd1d1456e71af57e000288f
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed multiple heuristics indicating the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161648963e8a03---melebozodazakogafal.pdf, are likely used to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://daechienglishpark.com/ckfinder/userfiles/files/fipabafemuxobid.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/388e08243e57f0777c65af9e628dcdca/madagazutifaxijiro.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/87485090840.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/43800035805.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/sajofigevesakob.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/vanisalofobasow.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/nuzamuraxinepas.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/30341246591.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/murip.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/mekamomamuradese.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/97843991028.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9cfc6e6d4c73f2995c3e6f6582e8b600/75963664596.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161648963e8a03---melebozodazakogafal.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vurubesela.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d09175c89d---koxabasozemaf.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/nosabowev.pdfIn PDF document text
    • http://contextuae.com/resimler/files/64369475329.pdfIn PDF document text
    • http://miminku2.com/contents/files/pumutop.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/xuzawovaxaxo.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/39172892856.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/rugikarobepepelezalirebal.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/47340602151.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20211001111012.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/83389795926.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef3025159---golujulukuw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=grade+8+history+questions+and+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10992 bytes
SHA-256: d3c700475a89be3a277d5d472064573ebe212a6290a7ca5ad74a21167088ecda
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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