Malicious PDF — malware analysis report

Static analysis result for SHA-256 e823b4c27206cddd…

MALICIOUS

PDF

59.0 KB Created: 2021-09-29 13:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 771b951c1bcbaba467727c99d0095668 SHA-1: 2f182944579e7795849591f7094d2f6cbdc09782 SHA-256: e823b4c27206cddd9c2fc3eb4e7c9d624b25b69cd8702c06eabcd31bc0786406
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7240

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=shuddh+desi+romance+full+movie+download PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd507cbd7---82862961467.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vunoz.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/jefonox.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/38790436178.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109060701115938.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/disazufefepegubewasil.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/morexixisemupovonowuvazow.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/57372501005.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/24863426185.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/11173590108.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bc57383a---jevudavajirukibisibex.pdfIn PDF document text
    • https://gilbertems.com/videos/file/rovejeninojiridow.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/71922251733.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/betegadoniwize.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/finevil.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/ragegupetetekagawinetajiv.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gvvmian2q4g24ef1loq2ft5clu/ridetuzuzojo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/naxivafi.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bidagivulafopuw.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/91435563416.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/sivagapavimin.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16150a548c7a40---ravujene.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/78176319145.pdfIn PDF document text
    • 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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 15824 bytes
SHA-256: 57fa4f6faca954f001244ace0657d786e8b82c8fc9567fac500bb6f6b65224fa

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