Malicious PDF — malware analysis report

Static analysis result for SHA-256 efddf575e7b161a9…

MALICIOUS

PDF

65.4 KB Created: 2021-06-06 21:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 342098ceb1d4433686eeaf3da0e33ded SHA-1: 359110051d44eb65c85bf29c9b322d0f1cf39f35 SHA-256: efddf575e7b161a954e8db7e916c247cd17e0b059f8d9be7a9306fe8672321ce
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 an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to malicious sites or downloaders for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

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://crewmak.ru/uplcv?utm_term=f%25C3%25A1bio+teruel+wikip%25C3%25A9dia
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51adb76e1---nofaka.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/627e5d62e5ee0de83905a42c97d6228a/kawepavopowixezuvemo.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfc238cdb---gimadekomodi.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adde34e94d5---wumasokadaloxagesusovi.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c63d6d1a---ziboredukatifo.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/3l47t3os4fga2b3sev40m1h3mo/11398842452.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3ceadec4---91755517811.pdf
    • http://onnetsolution.in/userfiles/file/dapumeveribagipikujiko.pdf
    • http://zuche0551.com/upload/file/bizodinajute.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c016ac04c164a66571372aa42e9a7a1b/lamirutexupevus.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d99e8993c---weligizuzemol.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c0e893239b7b7ecf9ab8512f2941b8e0/pijajoxabukob.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/29c33aa628e169da708aa46501cfd3b6/26523920573.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9109cf2a---xutezifedowololemixifiga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d678.bin
88c3cbc8ffb1802d6201f9519edd0ab235130a831a909504025172768485c574		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 5404 bytes

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