Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5caa78a6999e5f4…

MALICIOUS

PDF

124.1 KB Created: 2021-06-10 16:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e60601e5cd122eceb45397b50da2bd9 SHA-1: 323abbb9bc760ecb3913bc9e4bb7e99d60230d52 SHA-256: e5caa78a6999e5f45f534caa87f450d700d14b8a036a875f8d0d69d8f2a1795c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://laborke.ru/uplcv?utm_term=frankenstein+1831+edition+pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081d55fc8ff0---wulatawebodokijijesutori.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0db47f5965ae71608dbd6afe6ec60128/74523262772.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4896e5749cbecd9d4f0e2e975ebc0e45/zajuk.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pngucajcupb34tcuao7vjhdoe3/rejosirenez.pdf
    • http://ajarnveerapong.com/UserFiles/file/63637306532.pdf
    • http://dermalab.pl/userfiles/file/58647116631.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6v43etvjbmbjga873ju1hhamjb/21312254060.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eba0e7fb8b0b7dcc3e214d77eb36a59c/28488882051.pdf
    • https://kompaspt1.com/contents//files/tisisosivi.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1dce1ebb26994c27518558eab23aa637/21573384239.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/h44kloif542qevk090ltqk0d68/39282750531.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/p4u0vhn3mn4lglo1g8li5brvr6/biluwurimu.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c717e9e17---visedinilumutimufamoli.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160915f4467d72---72871255234.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c0ab.bin
be972c22a230b2d1e097857d79f8ec87b71f8794da9731bf111bd6e65db3ff64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0AB 5432 bytes
font_01_sfnt_off0001d341.bin
5f051c774f851ace20f0745aed05701524a6c0390030b1a03a58cb7eae787db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D341 10832 bytes

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