Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cc0a72d9d081d8…

MALICIOUS

PDF

72.9 KB Created: 2021-07-16 16:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c672b08def8622a6d9bb3b8eff2c919 SHA-1: c2c9c1191454be183ad88a7944b4029eefa8f2b4 SHA-256: d5cc0a72d9d081d8e4ba8f26a7493b34f36bbdaa23b801bed09e9241b1d53257
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are likely used to distribute malware or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://studiotipaldo.com/userfiles/files/9424127203.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42d8448f7---sesalavumodujapesax.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0b4r862v8lt2408chgu5lgkvm8/82441905554.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/gepogavuzolutifi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1ceab978016e79574853c33f0ccdb2e1/73400704471.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/vezal.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d79338474b4f0e43ac44e6e004087e47/suvifujuzepirasewozeka.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/11335139548.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f4c595f9b3---37452376036.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/63344692062.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077400d44da9---kefilasitifixoruxi.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/waluwuz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92a99c2fd---86716172388.pdfIn PDF document text
    • https://kede.org/userfiles/file/25357764134.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77ced4305---vurulevudub.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0te715ev59pq6hcqp9kugi892/6662115297.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a43cbf679---xowidiguniretakukix.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xagogulobivibujabaj.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/27401685602.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddacc1a9b---jazogugirofowudugogu.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/noguxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mother+and+son+duetsPDF 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_off0000be50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE50 10300 bytes
SHA-256: 2fa9364230886bd53527fe9303021d7f9078a1852a585c9a19fa9370f6a569a1
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 16104 bytes
SHA-256: 0d838217779cebce605cfd21c162a58e9ffb86856aaf9a6e4b3582ca19c28292

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