Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a7bdee3a279a41…

MALICIOUS

PDF

75.0 KB Created: 2021-09-24 13:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01e10d0c6d2b128b419e534e3222e8b4 SHA-1: ac9b05fe381fcb39b0d935327c692d6f1e8f9520 SHA-256: 52a7bdee3a279a41159625db20f43c266c8bc90eae22f5da25065f43bf0bfbd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=desi+tv+kumkum+bhagya PDF link annotation
    • https://araprinter.com/ckfinder/userfiles/files/60644175148.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210914_88D413ED8FE90FC4.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2skmo8jc0rl4scjinktqht6e96/loperalazadire.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/30859088284.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/bifemikixu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa13d9b3e---98703255723.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/pukogalusoxezaz.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/80182486224.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/wikamapobaxolilem.pdfIn PDF document text
    • http://pi-consulting.ch/download/jodozemosawaxulawevox.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/71763068438.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/gukezifebuki.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/35053780214.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/mijela.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136174c2c04b---95097936013.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/jomud.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/50348803731.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/mubota.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b35c4b562---15671074438.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/23558436420.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/38180128826.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/dapurivawizum.pdfIn PDF document text
    • 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_off0000b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB947 19636 bytes
SHA-256: 43cf45611a4a9892b3cd5d68b5e3fdc5d55680d32871918f4b66e79be410b024
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10700 bytes
SHA-256: 9acdcb5dd99e37eda97219817c068a718793aa212f7044ddb8d4613f97ec7b9a

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