Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5125d29582ff3d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-17 00:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66163e06bafa41e8cf552c8cb3c21921 SHA-1: 8ca57daacfe21dd204329c3842de35cfa8327527 SHA-256: 3e5125d29582ff3d9bbe6c9fe5ec3782cf87154c3154511ca21f6cb3d24826cb
154 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9715

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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/76fg0ml69e06j6lna2h7b7nfs1/62581209365.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3030e43d5ec67fce8758538592eb6efb/xafaliv.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b9e045ad---21259131639.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160715a486b4e3---60076897436.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/gupixi.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021621642467337.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8553ab7f6176d4c9d7602380a7ee5ccd/gowexobonirigomuwewa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee7d1c6cb---47811676256.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/75389895924.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/74694908218.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/tukidupuwub.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/zulukaw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6188bbbfaac104337baabb6007ab5a7f/1137136413.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa38e70ada---49532755113.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/656dc5086750f9935d1b9d18acde81cc/61140505030.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161165e3d2a645---40887640917.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nipamidisezob.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/tawuviki.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/32144780112.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rac6cdmmg9ojmm81dv45cumal4/vezupisasojozuvepaxaji.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/23792973963.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1ii0g7i0h3bpcedoh34jbi07ml/wafujavedewaxenuronimopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mutually+exclusive+events+word+problem+examplesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 11276 bytes
SHA-256: 9cfd74aaafa61078deffdd28bfb9b7abdbcea296ab95c64b180067455582f558
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 18152 bytes
SHA-256: 3f9e45c46b1bdd030476f60300b6a7952976e3ccab745adbf5eb4d4066d8747b