Malicious PDF — malware analysis report

Static analysis result for SHA-256 73136345899ec40e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 01:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2a0502ede62c12010b2125288221f76b SHA-1: 08b1ebf509c6aec5cbf6000bd9bf429a9ab7ff34 SHA-256: 73136345899ec40e72db44e262155a13aeffbca7c668c877ea2020a2ca90e420
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy/paste into a shell, a common technique for executing downloaded malware. ClamAV also detected it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://tch.lu/files/files/96846133929.pdf In PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210909_9AEAD08E653BB933.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/22672186685.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/mikimiremigisoxonuf.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c74b8d4915965db3f843c8e0ff37d91/53013463945.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/2427577199.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/91459319342.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebeb94d907---zuvowud.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/dilizigafisuwubawafi.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/vajutibum.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/sujitirolaro.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/58766908573.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/77425898317.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///xepowof.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210907103651.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/66849582619.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/89613012623.pdfIn PDF document text
    • http://travellerisland.com/files/72669309831.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/salerogudenob.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614063f589482---2643387530.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xirixilorejeve.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/85291883848.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/terukefuxelosoxeg.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/sulinomiguvavinusajep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+install+aos+tv+on+firestickPDF 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_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 18084 bytes
SHA-256: a7fa7686f010e44deec712b6451991d97b879b52e97f10cbe953191776e72723
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 10564 bytes
SHA-256: 148daf33b2090c4ef4b34a37d24564199c9329291021cb0429336b6831b9df89

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