Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fc8f554519ea30…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 13:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 186e90b5c7692669a6d316bc9884d4a4 SHA-1: 10521383d2d1fcbc9e0054a91aa4d9a34d467973 SHA-256: 41fc8f554519ea305ce86f773bbc084ae836b49589392cd46680ed1e22acee48
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, designed to trick users into downloading a secondary malicious PDF. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of numerous external links, many of which are hosted on potentially compromised or disposable infrastructure. No scripts were extracted, but the primary attack vector appears to be social engineering via link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://anthonygillant.com/userfiles/file/letidu.pdf In PDF document text
    • http://jandebruijn.com/uploadimages/files/dasopixuvuzituwusigetut.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d31c035c4---nobovimuvodinebogagivag.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84caed8f6d---webinuwafudemukadup.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/tijim.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xilusujix.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/kosamubiresurisajujepesuz.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/80208909922.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5d58q9a4p3j7k4i3tvfpohv09f/tekemajo.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/4849519480.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vafig.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/fojabevoginizo.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/bidowisofudavodaroxig.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e078b30d8f---popemoxe.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/56446075037.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/60071805849.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fc7c13c34---tukamemiloxupuzugudewo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/38577763334.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbde4e783b---68966566123.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/19040842622.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917fee4ec79---jozijen.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/timef.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/19532579716.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/38588483817.pdfIn PDF document text
    • https://cubic.is/userfiles/file/43096893207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=doordash+background+check+says+suspendedPDF 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_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16964 bytes
SHA-256: 3899a01c13ba3b160d18fb0da16666d70bcccf6b58b103a51ad8641c180124f2
font_02_sfnt_off00013d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 11004 bytes
SHA-256: bf453a591d41b7e48311e81604bc7f4164a37228c3177e83feb330fa39e53c6c

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