Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6b0505b0eed6ef…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 21:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c263440c2e781bde14c4df0e49d0fbf SHA-1: 3fcec0d02c47f8bb6c3efc33628975815a803feb SHA-256: 0f6b0505b0eed6ef5c65a0771dafdf84718058400b3464aeb09ff6ce4a0f0f02
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

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://mmtours.si/uploads/93233246302.pdf In PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/nolonenisobutijekigiju.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/96479082015.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/gefutiwowuliluwudewazi.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/tanezekama.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/8533136862.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/limirajiforaderusud.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/97243798454.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ug1fn99l7eve9jn8pmueq01rmo/32029455825.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/37782465357.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904144843.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/romusuxupabogefadu.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/matavawovu.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/30966487295.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/rigej.pdfIn PDF document text
    • https://purefeeling8.com/data/file/59669673944.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/11690294149.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/regokifaporefelidiwamimux.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/xajoxorosufonibebame.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/18059305426.pdfIn PDF document text
    • https://papiratisk.cz/soubory/79797405138.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c6fe24355237c9364932c06fe39a91e/47250981492.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/jewiriko.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dfc52aaaa0b3d45e15998151e831efee/36411155062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=subclavius+muscle+actionPDF 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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 10672 bytes
SHA-256: 053d11b93a72eb9844f56b0cb3b984f522c76c12b4e6316e0455a2bc8c1d4977
font_01_sfnt_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 15176 bytes
SHA-256: c2d4e384b646eb919e6e5db48f7b446a2fcbe34fce57a4625f70387a717f4317