Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5cd0c1c0bee0b1…

MALICIOUS

PDF

75.7 KB Created: 2021-09-28 22:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9cfa6ae4fc1a061d52d24451f2cfc09 SHA-1: deb228802f5821dbc18c2981834c176885c03e13 SHA-256: 9b5cd0c1c0bee0b1defee48258ded9160a5442765828a0f359b1e69dd89545f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised websites, including WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these external links indicates an attempt to lead the user away from the document to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=the+power+of+subconscious+mind+in+tamil+pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149176406d18---labakodigoxawozipusa.pdf
    • http://ternovykh.ru/content/file/61234289768.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c38c3885---53624226970.pdf
    • https://ntiverification.com/userfiles/file/gurukozo.pdf
    • https://benhgout.net/uploads/Files/file/54019746554.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/raravapig.pdf
    • https://steklo-shik.ru/userfiles/file/takaxiramuzalotig.pdf
    • http://aimecostruzioni.it/userfiles/files/14044056655.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/bazowabupetulerawas.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/badigovumiwuk.pdf
    • http://sunwisechem.com/Uploadfiles/files/bosinemeferilatamalidos.pdf
    • http://showdoimovel.com/files/files/12193031521.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kvgs7vg6e1v52br9nj6kksae32/meralisedilefibu.pdf
    • http://sabaispa.net/userfiles/file/silafugovedobokoxajeve.pdf
    • http://rudolphi.nu/userfiles/file/17583589499.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/1827102786.pdf
    • http://www.vikingmaterials.com/img/gisokomub.pdf
    • http://topstec.com/d/files/97761394366.pdf
    • http://stomerijindex.nl/images/uploads/mawagawida.pdf
    • https://zagorjeadventureteam.hr/files/92122899783.pdf
    • https://mgc.to/sites/web/upload/files/likuzufopakinidege.pdf
    • https://artesapanaderia.xyz/aym_image/files/lufuj.pdf
    • http://barcelonasixtytwo.com/userfiles/file/27167807462.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/ponofirofapo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bba3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA3 16792 bytes
font_01_sfnt_off0000d3b5.bin
9874e9bfd77943ee431a23de332911cd30e5c70927ac9df9a2154801a50180cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 19268 bytes
font_02_sfnt_off0001056e.bin
e17a47a4ab240942fa76afefb3519a22b4c04bc19b0cf20641b4db84f2b0bb54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 11172 bytes