Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb3ce0115ef3e84…

MALICIOUS

PDF

87.8 KB Created: 2021-08-31 12:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c07b49cfeee58996a72a1f356d11195d SHA-1: f4c190be545f14f7219bf4bf912410a4e36cdca0 SHA-256: bcb3ce0115ef3e845b80d39062bc7ac251913bbaf0dfd57b68e3fae08875800a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=international+swimming+pool+and+spa+code+2018+pdf PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610b26cb0b802---295076454.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/58719546927.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/kiraxujulavesuloz.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/nivelotimodutijudugorupo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f3af29e94dd8891d6cac1a830fa74b06/26111610748.pdfIn PDF document text
    • http://goref.ru/files/file/dunopidisanepukozije.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5dd9972baeeb44834cca0a277e04ae81/femim.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e72327d4e---85452602489.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c84daa22608---rejububineka.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/mpt8vemf19st4al692vabqtpi6/99214920725.pdfIn PDF document text
    • https://afayl.com/userfiles/file/28755043701.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/sedigerofibogiw.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/188812666.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/josopijolivefefipugudu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5120d3ed18---damajumosajixal.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/22023403988.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/46146752292.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fafcbbf590224df6a28c56fd257e8ac8/tubefototefezarejovegejid.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e7a36cb4---39606231110.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/xiweloneboxiluzakoj.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210804_48CE6DCCF699EDF3.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/23159553199.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/93535210739.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 17264 bytes
SHA-256: 235a2d69a9c0ef23b889bd3ad8eab46e702e54dfa30c18144eaa6ce2a8f0bf8c
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 11500 bytes
SHA-256: 9af8aa10e45801dad73014ba2e76aa41213207b448afa0857832ae0d1d6bb8b9

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