Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38db73d9ba28187…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 20:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acf3a2a9a4a8dd37d6a48782a2468bca SHA-1: b03cfb527564a56b23f82a40caba2ef99cafa6d7 SHA-256: d38db73d9ba281879c9b6ce2104bfe736df6b24c95c8a2983b8525c5149e9bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and heuristic firings suggest the primary goal is to redirect the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://haki.vn/uploads/files/tifafigopugewu.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbe7c3a41---mipewojefaf.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vatewetifomabizajob.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gexekupejopoga.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160925778669b4---83559838185.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gt7kqmttp5saofdq721326vmn3/17615787952.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/xoraxesuvituwoke.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9c3f200364b65247b126cac8aad7c4a/83269965973.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/nosiwewoxujunoporixes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612adca87ecce---11213879379.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6a70e75a---mojuvus.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63879077922.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lebadojanonuro.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/geranatanufar.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160907ed591025---xavivorowidosevebawogomas.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b9319910---21106913339.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d5404b6d---15750410145.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/90492976946.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/38822439534.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/kigumitemivovetiriben.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/galumo.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/nedubuno.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rekus.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea39ed247---76304156549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+pdf+example+filePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 17692 bytes
SHA-256: be8510e950c7a449f9ef613e2a01b15bb1fbfde4070a2db0e6da4cb964c3a193
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 10480 bytes
SHA-256: ea20c4c1e5a32658ed1ae862347afdf3099ee70db0809d7a02090e254e5ece92