Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1066a5bd7209840…

MALICIOUS

PDF

94.6 KB Created: 2021-07-25 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 617a1cfb182dfd4f4495d69302c182b7 SHA-1: 71f0d5595f2ba1ea431538ab8de712f5584e767d SHA-256: f1066a5bd720984094596ceb1f9c973b1499ecfba2324cc1b6ccf8d070d0ff4d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious or SEO-manipulated content. The ML classifier strongly indicated maliciousness, and the link farm behavior aligns with common PDF-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://esoftland.com/userfiles/file/fabox.pdf In PDF document text
    • http://22743333.com/userfiles/files/zugiredijotalukabiwu.pdfIn PDF document text
    • http://skomi.ru/img/files/file/purigadifisibenom.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4563d172db---kizikanonuvexakakago.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/kusekadegevejivejuxe.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/xazanosiviti.pdfIn PDF document text
    • http://yoron.net/up/files/69723141188.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607940908dc54---dasuga.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tinit.pdfIn PDF document text
    • http://learningkey.org/userfiles/40065761548.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4fe00c79c495a838857bbee9a005202c/pusomunuziw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/26c8c80cd4fcd39785c6c7e77afd9f8f/11934181871.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21422e05b---44688399222.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/23721899037.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf665392f69---koxotoxagopi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f0f2777f5811389bdc4b8df5849561a5/vigoxebudabepupuxu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd6a13cdb---27307307311.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b4b16983fde0df1fc2d770865abd1232/95530233818.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75f3b170c1---datuxonamepobob.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/17769040688.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69bb48d8de---tujadiku.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/gogurajenazejafedu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/89549179972.pdfIn PDF document text
    • http://quatang3t.com/upload/files/17405474129.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a7a1ab237---rapodatorefewedam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+responsibilities+of+a+retail+store+managerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10940 bytes
SHA-256: 941fa42eaa92459632146d6da05c4957d9a2cb9c6c65bb3571a7de8a86947e9d
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_03_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 16932 bytes
SHA-256: 936df9043e7db9c59423bec91858ef65957351588ea7f2b705053656ec942891

Open this report in the interactive analyzer, or submit your own file for analysis.