Malicious PDF — malware analysis report

Static analysis result for SHA-256 06194996e0547704…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd323523c7fc2e473c7fffb6f84f7e23 SHA-1: 5c449feaf7e6526b62dc908b5804b2a10ca7ef6a SHA-256: 06194996e05477043853846909e4064f4dacb32b593d8cebf047a583efa6b0e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which is a common technique for distributing phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URLs suggest a malicious document designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/87282cce21bab91ccb215d63b1b07bfc/26381139448.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nujak6fsnoffj5esus52h51fn6/wulenubulaka.pdf
    • http://wtmongolia.com/materials/file/45651899388.pdf
    • http://kompletucetnictvi.cz/files/file/xukobivotugavuzep.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/eb846365c877800dfdb446d9416d8e38/36900561085.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/b7sb96re41aurjb58h54ohks45/63985193797.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076df777f07c---16783454662.pdf
    • https://sanruouvang.net/images/uploaded/file/40038039402.pdf
    • https://aradovan.com/userfiles/file/kikuf.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/solozumadagi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608867997f585---jojevovufev.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5cf9d3acee976268cb98feda20724b1f/42224104442.pdf
    • http://thunderstar.cn/userfiles/file/20210501164638208300676.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2d92f1f968877037dfe22dcb6249ea2a/momimotowosoroxow.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609435b5cf07a---76430781274.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160709920b954d---5507002525.pdf
    • https://bursakaynak.net/userfiles/file/sebevebadalu.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d194d4db---lixawumenovofulogunaw.pdf
    • http://say-international.eu/userfiles/file/15612675697.pdf
    • http://creatinglifeoptions.com/userfiles/files/fupenemodojubibusururu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1126c68b4---sanuvu.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ca93d533---78400321161.pdf
    • https://smithsgame.com/calisma2/files/uploads/sidepuvagigexudi.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/63774164633.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a701d8e60bc---makirawef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=heterogeneous+solution+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
font_01_sfnt_off000101bc.bin
8af42bdf7f01dd2ac75a4bf8e62c2a22e50e978d40dea492b6e77b69d7261a37
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16876 bytes
font_02_sfnt_off00012db4.bin
20d6b8dbee0f6a7d6a0d274e8153de01035e75bd3267f3ce423315c32ab1785b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 10540 bytes