Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c2555b43d6aa60…

MALICIOUS

PDF

85.2 KB Created: 2021-07-10 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9fcfff40b691c8ac4428911453fe7a1 SHA-1: 7811ba74808677080bc813ef9dee7f31ff9d48fa SHA-256: 32c2555b43d6aa60b00c994ffc83fd87d9d9a253ecebc8128527768f8e165b5a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to lure users to malicious destinations. No scripts were extracted, but the structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04d03a561---resuvu.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6336a4a6b---punugizelobabimi.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/33589483638.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/cra3gini333iihhf13tcvc6td1/24682015721.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/72001191415.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e250862c9---66867954308.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/79404685391.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/zixudexoxonalademedafiwa.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/87455609619.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa155b0c98e---48730332234.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k07okalupir647nfglo7fdi3n1/kewune.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13759ec6808eb1f3f82f4b059cde298b/zidisorawutige.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xilasijodukexavat.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031329213373.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/694856faea11853027bbda82f6bae2c3/ginitudupajuxageb.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/penibogepuzigitit.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/912f75d4470ce605d754e7240597e83e/48798664383.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1b53e1de7295ebd03df100c7ec7d82a4/vejisif.pdfIn PDF document text
    • http://cycling-software.com/files/file/wesuvuxijubijija.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/64052682765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=shell+method+with+two+functions+of+yPDF 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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 18600 bytes
SHA-256: 0fc025d8fabb26d47bfa6a839344de219a80fc9a59db848986a704698e54720a
font_02_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 10856 bytes
SHA-256: d1eb8f0633bf37b02cbb942130fbc94d9b5663ab8802933b65439b0017d2a7c5