Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f251d5ecfab1b2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 04:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4ee6c8bf16481252aad1a4cc01d14f2 SHA-1: 85f753a456385b27243436d9cf6523e95edbd144 SHA-256: 00f251d5ecfab1b29ea0c97ebb111cc05644b4e029ad336335860fcd1468ddc1
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This technique is commonly used to obscure the true destination and distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6e957f832f3e9ee7b3c41439df3407fd/80065826520.pdf In PDF document text
    • http://brcassociati.com/userfiles/files/4353889095.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/mojejakebom.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36dfcd205---50026104615.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/44610667980.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/82884356021.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082411d28ded---26606392050.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xomerat.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/gaxavubo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607443027d0f1---dubavexizu.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/33574215498.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/kiwedexudasikokezuso.pdfIn PDF document text
    • https://okazionche.com/files/34163329938.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/5879756783.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/20741779505.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i7cvcqg1vnvo5h31h25udnr2e7/zobato.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dbddae1bc---gebaxekow.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/34799631141.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/sojaxofarub.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/togumivubamuwafa.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/jigulanuzowivufiroxutan.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/71139900912.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/jesufegaripur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mixed+numbers+to+improper+fractions+printable+worksheetsPDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 17312 bytes
SHA-256: 2a3db0aaa634a7a59015dcd12ae613377260bff6d0b7b36dc19e8fecc8b944dd
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 11396 bytes
SHA-256: 41ba7594903bfdf8953894a48f0c9a4492120d70eeeae58bd3c48f8928cf7f4b