Malicious PDF — malware analysis report

Static analysis result for SHA-256 321cfcde4618f76f…

MALICIOUS

PDF

73.7 KB Created: 2021-08-18 12:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3789430b23917e7d019390b6995fe88 SHA-1: 2d4243614cc4e0ece31d3b2ae06d44fbd726e7e1 SHA-256: 321cfcde4618f76f831014a7b77db11f27b80eef1bea12d02141449cfad0c888
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, limiting the analysis to the document structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7569

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 http://www.lukoilmarine.com/ckfinder/userfiles/files/muwofuni.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e88571bcf5d---46330674891.pdf
    • http://stacjaregeneracja.pl/userfiles/file/60537591471.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91ba8e54---70375041520.pdf
    • https://vnsteeldetailing.com/UserFiles/files/7144867250.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/44183d2637383facf44011711c8b0f56/43735230777.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1f7e9b2b0c1e757a0e4a2a47602a1fd1/mikatexadabowiwuduvezukum.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97525e8593---minedojakexegutu.pdf
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/vinelixelopap.pdf
    • https://xlspandoek.nl/userfiles/file/16805100837.pdf
    • https://loctra.net/userfiles/file/vevumujejejawulumipep.pdf
    • http://fonnepal.org/userfiles/file/88124145204.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210729_DA5B937E15BBC3A5.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/taser.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s0kllme1mnir6l0afdf9550et6/63326292958.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4993fd25596f3dfbe36cc93079cfb795/fotixex.pdf
    • http://shinex-auto.com/userfiles/file/67792846536.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/locnkrj5t9tkc98m9atkvlknq1/41560453091.pdf
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdf
    • http://fresh-j.info/images/uploadedimages/file/dixipavadubomaj.pdf
    • https://emprenderem.cl/files/1800993361.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19cc72e1---kebinanadusujoteladudem.pdf
    • http://hk-keber.de/images/file/13485324515.pdf
    • https://eletroluz-al.com/_IMG/img_internas/file/51917115070.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=propel+star+wars+app+deutsch
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e830.bin
3b7753091da102aca209e3ac9ec20e2ec3a8438edaaa05b12821090b858234cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 17948 bytes

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