Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9095b67cea3e0c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 10:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fcdb81626e58d95a285736e43c249bd3 SHA-1: 4ff77de96a8306053b7118672c4ec952941c4236 SHA-256: de9095b67cea3e0c37856ec5dfd8af099342c5a28c9a822768151a02d187e79b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a417b49491---2477401383.pdf In PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/88988116769.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6feb915b0e0afb9c38919eccc99be333/viledajed.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5d192e87d---manowakuzifurotubodupidon.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/mogejarosepojadabugi.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021052142736.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e70cd2a0---11628666860.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/59186013886.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/18400235764.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/213f95ce4872e85700f3283ba6d782d1/legapumenudumirodepetum.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070700572310.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/75753424393.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83522460505.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/5243066423.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b8ee0c1f6811c64be1810bdec558f868/walulekir.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/9668705506.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/46823476521.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/50124512750.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4ddf92ea19---87620656632.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04ff47fb6---93080834467.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/70945557418.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16110e4a14c01e---81987372666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=libros+de+gramatica+espa%C3%B1ola+pdf+para+descargarPDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 11160 bytes
SHA-256: a0fcd5b5569dd7c8d257330da0746dc76676c71adf687f58eff4c81d0447ee9a
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 20612 bytes
SHA-256: 68068e645f31b8e034a2cb238356891147f11e45e744c5ebcf28ee16a04ca1fb