Malicious PDF — malware analysis report

Static analysis result for SHA-256 5120064b66ca2c40…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 09:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed05d37f15d6314f3a738dfe99eb2260 SHA-1: f8de60cab7fa71fa567268db0c2fda148f60c391 SHA-256: 5120064b66ca2c40dcb64a0e5d1ad64cd579faf49d9381e058c6d86584fec053
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a link farm pointing to multiple disposable domains, suggesting an attempt to distribute malicious payloads or conduct phishing. ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://redigonda.it/userfiles/files/babiwuvuzaxisawigedum.pdf In PDF document text
    • http://retrolondontees.com/userfiles/file/49834293114.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-10/images/files/37508158920.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/fexol.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/lorejemibubarav.pdfIn PDF document text
    • http://eko-uklid.com/files/file/77639954623.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/96030751463.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/jesipekej.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/wapuvonazeduxin.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/bafisa.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/dodazezidifurefefawubopez.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pb6l2pfcani4cclb0437338l5n/10468964250.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d77c6sgb5t0hnrla2t2tfpf1bj/risepasebuvajokisa.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/31248288800.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/41478546282.pdfIn PDF document text
    • http://nessium.net/userfiles/file/40674595963.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/naxazax.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8c36bf8b---vimumeduzus.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/mosigekanoful.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/49892645238.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/rurenabeku.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133eca003f4e---31816951480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+free+pic+editing+app+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 18948 bytes
SHA-256: d92bd3ce8a7871f8013a631c14bdfadb46af0d7d5088a70f8de4be4435843d9f
font_01_sfnt_off000138a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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