Malicious PDF — malware analysis report

Static analysis result for SHA-256 a137f56ca1dd229b…

MALICIOUS

PDF

59.5 KB Created: 2021-09-08 02:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94eff487f43977846b6a5d6b16991e47 SHA-1: 6808aa797deec84eea759a618ec712fe545e14bb SHA-256: a137f56ca1dd229b12b37edc45f91c9df91eca19116409c7e06b725c88ad68b0
154 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086b9b60cde---49546931694.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d5f0a4aa8c44242f4966d959526aad9/gejivuzogu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xukazilerowuwefolitekow.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608722ce6a031---romuxelarulusoseviji.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/coee2jfls22e53d19aclthjj02/77514868132.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7a2fc8682e20fbe4dfa2ebbd2ba4c850/lunakaxunamune.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/3138993700.pdfIn PDF document text
    • https://motiv8workout.com/up/files/62230567479.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607935f5e0c3a---ronaxobimukari.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021082210034673499.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cdab166b1---wisedafobuxe.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/12642391433.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210714_C8B7C92AA75F8E48.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c51528d3ebe056d546dd6e5c84ab69cc/tepanudexuxojomenusavofas.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/somosiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcacbd8353---rorifoxukuzeki.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/14vqlo2mee43hn32nond1krfk5/20580124676.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b2071e0d0---milirabanupe.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408edcc0ad---14807322610.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb673b0678---27170858301.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/jusomidulalebakomadaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=titula%C3%A7%C3%A3o+complexom%C3%A9trica+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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