Malicious PDF — malware analysis report

Static analysis result for SHA-256 910bd646e751c1bf…

MALICIOUS

PDF

96.8 KB Created: 2021-07-05 07:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3c61c75a04c0d871e8a0b6028b41a96 SHA-1: 211d97d279d3d0630b655b03786e5f9a85b54f61 SHA-256: 910bd646e751c1bf5a7be98dbbdd445c9118a717349dd672a8f53b62dc2d9c1f
196 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dbaabc4e---25461916776.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714e1daea36---lipujuvokumusifakaroji.pdf
    • http://digemnd.com/UserFiles/file/77766333081.pdf
    • https://local-atlas.ru/userfiles/files/73978299740.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fimati.pdf
    • http://fantalife.nl/userfiles/file/78537135586.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41f92c02a---safonosofixoxusekowabup.pdf
    • https://mebelihome.ru/upload_picture/2537772788.pdf
    • https://parklanehotel.asia/userfiles/file/79804194228.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca031acd4ea---bowiw.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/07b56981c894a49b1b172bd964d72a43/18128590026.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/noxebibakarorenagizetiraf.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff90067f1d---93486276822.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/97bd8ec37e10e51889bb017842ee1a45/lutosaze.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/53184430951.pdf
    • http://biomassasia.net/data_ed/userfiles/file/kobujedabemid.pdf
    • http://niezapominajkowo.eu/userfiles/file/51217095672.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ee08b78e---zopedewinetu.pdf
    • http://centralgiving.com/media/userfiles/file/wejugowa.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/77bd85634c47acd43ae8ae42167b09ff/nolekimigefibojux.pdf
    • https://mps-india.com/userfiles/files/xosujako.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08333cf1e---sobinagaviwol.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860384b3d57---xiwojikiviseni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=d%26d+monster+cards+printable
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cecb63bdeb9f737c7af01498a1322941/38829428647.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d85.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 9076 bytes
font_01_sfnt_off00013026.bin
dd0b0c6b6ae4f85a3a1a692b07954b74cb2e4a471420096ec2df812c8b980886
pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 17536 bytes
font_02_sfnt_off00015e68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E68 16792 bytes