Malicious PDF — malware analysis report

Static analysis result for SHA-256 382a59ad11442fd0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 14:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08f02b71b10fb70f886be89885fed09e SHA-1: c6cd0ea73bf07ca10b0ac3a63b18e7710bf5f28e SHA-256: 382a59ad11442fd0a00a80dea893f8a179c9bff2dc8384f7371e07789b852f6c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms and potentially compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=precious+is+the+night+full+movie+online PDF link annotation
    • https://psystat.net/candyticket/uploads/page_images/files/butaxepelevefa.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5b76c531---45085788264.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/xetujamemeko.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/fefevafasovebuxugored.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/lobojumoken.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/74572140321.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/vonijusodemoxeze.pdfIn PDF document text
    • http://coumert.com/images/file/xifujut.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/24583018113.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/48862891385.pdfIn PDF document text
    • http://imaginove.eu/data/Files/birosenokiluretoginepor.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a6d604afe---botajumadibon.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/85941ccf9d11178120404362900fe2f0/xofavanojabugamesokanuv.pdfIn PDF document text
    • http://labonscafe.com/userfiles/91595557162.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/makigufalo.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/xeguwew.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/37293543703.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/nogizaniwetunib.pdfIn PDF document text
    • https://ms02bet.net/contents/files/61260608331.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/digofinegik.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/75961956070.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/34440780084.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210903055225.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/67700283683.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdfIn PDF document text
    • 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_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 14468 bytes
SHA-256: 0b85550d6bd5f3eac21a1437fa96953337b9e866f787e5678b4464ca0dda313c
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 10788 bytes
SHA-256: 8e2f6b770d37afa525882d852371e8a8d562f7c1da74809f01aab69e17e5c5cd