Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc50cbbc14d586c6…

MALICIOUS

PDF

67.6 KB Created: 2021-06-09 02:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 17fbcb3b482a6ea62236068d74d3fd1e SHA-1: fcce2219304fc64842b723923ede4f5fbf022a1f SHA-256: cc50cbbc14d586c65d72e66c93ec5bbe997c6a75685c663d3759dd6ce74e3c4f
154 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which likely serve as redirects to malicious content. The PDF's structure and the presence of numerous links suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8311

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://irlanc.ru/uplcv?utm_term=relative+frequency+table+example PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4447vk20i5qdi64lf6ugdeh5mj/14572226583.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/letq4no85k3nc3vps6bpgopu2e/2228087171.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0837ee81b8---94086589664.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0abb7e130ea28934ed821137bc250205/71971942285.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/10575951886.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8357a1413e---45842718415.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e322kaa9hov45ch4k1evmpb5n3/65155174738.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/12911777174.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gse8o9pb741pklk1fhe18btfvd/11784365436.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945cbd21a74---doxetawabarelobatudeku.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kjfmec23jr54pk1655num570m3/43911542194.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4df4bbd990f558af9d0a3d25dac7f34b/jinamugolowafak.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qqgv5dk2s40m10s6fpdpksecal/medigeg.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f116a5dc17---50357193568.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fasuxegofokefiwobova.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/77311641938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 5488 bytes
SHA-256: b96703f799367a9769cb03afcd8ae7fb4275f22b63e8808c98fa467191762717

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