Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a7d82546bb3685…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 09:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5a8a7249c27dc0c5d5aa915fbae1808 SHA-1: ea16a5d0cd98eaedf3606f0754332cab4afbe8aa SHA-256: e2a7d82546bb3685e73b879a97c640a9cd2e0fd51e0f07e16aa38d138b3908eb
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF documents hosted on compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure suggests a link farm designed to manipulate search engine results or distribute further malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a709e4bdc87---sajotegunamisi.pdf In PDF document text
    • https://akamercedes.com/images/uploads/files/tefomusorijixeg.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e98e05280---67734228001.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bepobuvobumod.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/53948107280.pdfIn PDF document text
    • https://sanidom.pl/img/file/34566979412.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99379d63dd---wazawomexur.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fenoxigulor.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/43cedb97b1d6c9819ad5b6572f18087a/musapapijejojegofovuzig.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/30263502017.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2nl4gr9u3b9t980n512tm1t3sv/29129300331.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/sofolofetawuwexekef.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136efa57cf9e---pagatowaf.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/54232698041.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/42120449895.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf14d68e5b---vokapavat.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f194fc30a3e17cf9b26075655d0741ee/zorefen.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/lemesefejupevomefepa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609469bb095d9---96708621731.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/471e8ce5b0a7e1c48c2a106901adf49d/doduvawogufudafegefizusa.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/munopilovo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tujuvololawoda.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/46706065413.pdfIn PDF document text
    • http://compsult.net/userfiles/file/64259153969.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/76495736449.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/67561843418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=iso+14001+standard+free+download+pdfPDF 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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 18324 bytes
SHA-256: df3a72adaf8fd06eb9304453a9340489eddcc84b809c8631a11fc3bfe2400098
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 10688 bytes
SHA-256: 2c209ba9fefe6754cfb369d92c894923c95b2750b750005e99acfe7f9a3f5e2e

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