Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3db0da30a04132…

MALICIOUS

PDF

70.3 KB Created: 2021-08-02 02:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ef6530c55fdd88db0833d7fa1bd2146 SHA-1: 581a4f9b9f62bb9261c18303b7e1225fcad21627 SHA-256: 5a3db0da30a041320b876c9e0d3a68dc6fdd8cf27e0810e7b6a389081afaf107
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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 https://advertisementnepal.com/ckfinder/userfiles/files/26790762521.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b42861bf3---55660956719.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aa4b1615980cbb8b94fa3218f225dc5/gikasotedubisetimegutez.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/29268974910.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93739024264.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/80825846731.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/64326314541.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ac69bb63c7324dcef50bbf7561538cdc/65338164517.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8f7c8cb5---rakoropuguzorolisizejune.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/12108451571.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0d7039715---tusenesibup.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/34845857995.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/fisiwojevixuzolovagelofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fc73dcec---biwudovukiviwixedow.pdfIn PDF document text
    • http://evola.it/userfiles/files/jutujumuto.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/kisore.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vonozusixosavuturipelujo.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/29681201741.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ddb738322f83a718fc0bcde67e0dbe40/jofawisepilakijedixebewuk.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/zekiv.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a047f05a---17071558965.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/71376999060bc481863331.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb80f4e9f1---4479909565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+most+unique+girl+name+in+the+worldPDF link annotation

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