Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf889976390689…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 16:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 359bc0b4253766f23841703ab45ba676 SHA-1: e488b79e1f54bb4deca6beb4aad1cda5c6a8b5ca SHA-256: 83bf8899763906896359887d88d8cc28f2f347b1e957254e02bf026e8e54d284
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and exhibits characteristics of a link farm, directing users to multiple potentially compromised websites. The PDF contains numerous embedded URLs, many of which point to domains associated with content management system upload vulnerabilities or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4054

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ipost.mn/ckfinder/userfiles/files/61373176037.pdf In PDF document text
    • https://escaletravel.com/userfiles/files/kinitibijuxugebenopababi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404f3a175ed---famelolinuxunupalosiba.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/22942887763.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/refaperasejadovuluwavep.pdfIn PDF document text
    • http://apsons.eu/files/file/zesokuxuxiwiki.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/48555946132.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140925be8dba---70982140419.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/uo6jtmgtva6jkf9kn4j1gkn2k2/nejulidurig.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d70ec0e09e---21350639763.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/texajuda.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/piduxozavotol.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/nefuxivuku.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/jakudabowidaxikoraf.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1abefb19---46557190838.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3c08ccba---84785170428.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/21942862751.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/nujuj.pdfIn PDF document text
    • http://baove24h.org/upload/files/7007490150.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pob3oosfo04ouprnmsnc3rilp7/lifozuwoduvoluzojajowozeb.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/70727688159.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/tojixavifimib.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uh016s6h7rem542k1mj0mh8rs2/27867288481.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/39312783961.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210920_162008.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/logisukoxejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+filmywap+bollywood+movie+downloadPDF link annotation
    • 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_off0000b6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 10680 bytes
SHA-256: 99bf36c3092e1b52c10b35c5f2235561f87ed8428616ef0268c8cd5b2cb29368
font_02_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16080 bytes
SHA-256: 056ad2bb5b0b9bfe7c0894c6dd40f4345db1fa375994f89827d2efd7e4597ac4