Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b24475fec401510…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 13:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fdc69b1f4d0f6f7ed069a79dbeb0ea9 SHA-1: ec9e0369460f35b0831e3e04259df646112ad6be SHA-256: 8b24475fec401510b78bb547509b9bc101dffb3aff9057e19c0e05c9aed00b37
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URI heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=media+movie+maker+download
    • http://axi-hohenstein.de/userfiles/file/fenozoxi.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/solexujozajamoviteko.pdf
    • http://moscowballet.ru/userfiles/file/badakaku.pdf
    • http://monarchiaerembolt.hu/tmp/rukanimaxadita.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4152v5p8ijvnihmpu1skth7l62/waned.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613558df1b0ff---tedadosebupodifetasukad.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/005c7c6717bd2e70fb0eff0f413ee4e8/86088494671.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f55e9d37bf---66351348005.pdf
    • https://itchanoi.vn/uploads/news_file/govete.pdf
    • https://tsolisp.com/files/file/98708600265.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f6f7421eefdb02790446c2a23ed35d4c/rotobapilomem.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/34901150780.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/15241831203.pdf
    • https://tese.in/ckfinder/userfiles/files/jeligaxiga.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/fojitiziwalojuvapemi.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16131aef1c963a---dibuxalaxenud.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/rigojumufudepepozuxo.pdf
    • https://ganganagardentist.com/userfiles/file/46153173665.pdf
    • http://novichiha.ru/pic/file/mokuwubad.pdf
    • http://marketingnews.fr/images/file/91057118285.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/rabafinesikomirebogulup.pdf
    • http://willbramephotography.com/7785459542.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 16792 bytes
font_01_sfnt_off0000cc66.bin
5c49eff5b4d92adf644546d255c8a67fd5fdf9889a8dbc8e660efd7c54145e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 10380 bytes
font_02_sfnt_off0000e3d2.bin
40f05c0d1411d29272aa2b32418d8ba5ea05fea6475cf00d050a05b71e7f6017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 17012 bytes

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