Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5952259284d720f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 04:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f645fcedb9c6350cd039a97eb8a5c7f SHA-1: 88d25659827f0ec3cbb2315fe9407ec9859d947f SHA-256: f5952259284d720f5c805949d6b1edc8bdc88cb9f0175add2ab153c92ceac7cc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wcfkenzi.com/ckfinder/userfiles/files/logukutuja.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614287d6cfa6c---fodiwalibewuwuwabubojof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad91cdfba---35265964246.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/41708583387.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dd3371ac805c8558f8897a160f78c053/87648029150.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kadijarowigofenamadudu.pdfIn PDF document text
    • https://phnews.ro/files/file/95289131875.pdfIn PDF document text
    • http://szwygs.com/upload/rezafavedixosisipeto.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/kibitulilafusabuvivinon.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/pesapubevebaw.pdfIn PDF document text
    • https://fivetc.net/uploads/files/48714672251.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/18473778408.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0c311caa06a1ac710276bbf436acb732/75127923734.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210913_050055_133.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/20883176573.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/wuvufakevuravafamomuwip.pdfIn PDF document text
    • https://moolans.com/uploads/files/jimarodevol.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/26119625438.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/joregipazatexejax.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/dajetakalim.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/bawupivajasixiwiwavumunir.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c466a6a089ea0288dc3a66f582fdc528/tikunuzovisulakulejijem.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614269e6d1f21---junisawepisikov.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210902_26A50A030F267A6B.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/52696187573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=open+world+driving+games+for+androidPDF link annotation
    • 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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 17208 bytes
SHA-256: bea4addc7eaf7a268bddecb67096da95f508a4e4b06ff1f11dac16658c779fb9
font_02_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 10920 bytes
SHA-256: d96f22441d5568d6ebee2d77a925806b8305b382a844e9c615bf5ce1d15bd4bd