Malicious PDF — malware analysis report

Static analysis result for SHA-256 8079ce5db74a73a0…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 07:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a07c87a95eec4cc35f10f907eaf0d9d1 SHA-1: f35fa34a16088e83157933c8c2481c25e7da33bc SHA-256: 8079ce5db74a73a099d9ef2cbe5d729e07bbfac609713c3fb5d27692f50d3900
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nasapugu.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c455851a---28290039201.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/36438920678.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbee5bc37---65855010346.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/88ibplnphqe2sr8m9tucub4bs4/62765757877.pdfIn PDF document text
    • http://hydrem.ru/images/file/26484558696.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb5675c36---winemarosami.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7c11c36b88f42bbb6c619c2903df1a9a/62426144478.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/24034369580.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1ceb7276c8798e291287152fecf605cb/zigizevefa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d77f3368---doguxibejizazokilofuvag.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/wiwazanobitopef.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/19614270200.pdfIn PDF document text
    • http://stevis.cz/files/file/37162214604.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/22319694231.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6o8pcco0q3bb8lsaqlitl5bibs/56417065609.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607598b97d798---rolaxaw.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4640921419.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed9f657ed---67297158246.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/75519760763.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/75022369217.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4784d9b66---kasuxaxanexalewenebigeze.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55525eed4---jovenaxazowi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4081c3fbc0d22b79ff7b66b981e6914f/90707025496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+bronsted+acids+and+basesPDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 17212 bytes
SHA-256: 7e130fcfecb819ba83d4375d84b9bdcad93d3e24394665339ac8adcbd4dff2c3
font_02_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 10552 bytes
SHA-256: 4f05d2e8354c4bde34c1401360f5e41d80e07c3cdb32ad2c3d3d60f60ef0a283