Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d4245b006b294b…

MALICIOUS

PDF

62.3 KB Created: 2021-09-02 03:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c580a7099574d234c8bd7b4a69fb3b41 SHA-1: 6be3232a5ba8a84435e2a7c244fac04c1e717611 SHA-256: f3d4245b006b294b1bf45fde0d1080d10a1f1367bc36792e857e79ddc05245a3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

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://abwsalisbury.com/uploads/files/50420352282.pdf In PDF document text
    • https://emprenderem.cl/files/zovodefuzijifi.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/gokomekarumadolor.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b1da164d---51183582784.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/fubuva.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/25710559004.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6oj1kaf5mraubemtfimscqjhm2/58717911414.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/58999475643.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39e4538ac---68375206718.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd82decff---vibopedilavivilus.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kevexisefamofesejo.pdfIn PDF document text
    • http://belniig.by/public/file/wizenideremum.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/xularekebufob.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/divimibuluwizije.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/35017150578.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/xeboxadibivoxaresesukomog.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/kotujunanulis.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/mixap.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/61256406312.pdfIn PDF document text
    • https://sce.tw/uploads/files/60d3d53de4ea0.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/36483113082.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/zijerogagubanat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=phytopathogenic+bacteria+and+plant+diseasesPDF 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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 11048 bytes
SHA-256: cf471e2f1024b82f1f342b44dafb6bc02ea1a7351d85997c1ed8855788ae9958
font_01_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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