Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d08252314e4ec8…

MALICIOUS

PDF

88.8 KB Created: 2021-07-30 05:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f7d8f3b94f4b40503f4b63cfb10714e SHA-1: a6b051f99e5b511be6b6cf8bb3e92d018a991f12 SHA-256: b9d08252314e4ec8b74071bc467f00eb46bb0bce645fa6555a7d69e3da974daa
96 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://avela.md/userfiles/file/bedadewuwetozawoxofevu.pdf In PDF document text
    • http://maroba-zirndorf.de/file/xazozefuzosarivibewijad.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16077712d8d78b---65885793605.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pavefopusubuteb.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fa9b2a9a---selufe.pdfIn PDF document text
    • http://riversedgefm.com/files/file/80864276023.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8144a9fe44365027786f43fa29d25a34/25652986991.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c386f672---43310526630.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4da406c997---pidojos.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/35aa6c1f9ad2f5647ef030bbaea26694/wipivikomixu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a9894eda---24575206616.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075016884a4e---24205618892.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rirokitokoto.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/golavalaxoseparopedaki.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qppunfq6c3r5aotop65fbkhvjj/5783696531.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e370feb041747db64e092443811df7bb/59357341786.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/22596689880.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ro6dp2spg0h6qlb3v3od0uj9hs/98640476404.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2e5486eb---gifirusuboreto.pdfIn PDF document text
    • http://btcauction.vn/hinhanh/file/27133899119.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/jezukuge.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160824005e1880---fanimebisobujumiz.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/394d77cdbc87bba39e282318df0711a4/15762954024.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/25374682873.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fa5fd9dbacea7959e1872886613d6050/jutevawowedegosupinuroxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=comment+faire+pousser+les+cheveux+afro+hommePDF 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_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 11044 bytes
SHA-256: de1c103c2817eb4306da9f29944c743aa8776d25a6ecfe7af4a19ed5b23853ed
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 18376 bytes
SHA-256: f619d15f85e5b90670bae3d41682d1b86286c85ed0ce1fbe3603cab15ddfb1de