Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69cfc537b0b8af6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 06:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17e80b1769b52aa4f921fec8548a421f SHA-1: 69e81649c636c5c79c813a3236107f418d96bcf2 SHA-256: d69cfc537b0b8af69aebe3d4467d40505f982eef0563f843b08c3a86ffe36d7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://tutaylamhet.com/storage/ckfinder/files/94686289063.pdf In PDF document text
    • http://lotusburbank.com/uploads/files/texowen.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6di3b0r1t0rtc29gqloqgaiga5/1248629626.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/71eb5d1030099445762ca177928231a3/puvakaluvolarupu.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/jofodu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c01cbbe7d8de00835290a8d6e6f7f2ec/forajized.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/fivilenewirut.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kixasuxiwugekape.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/49032810649.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/musozuzobosuz.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/20158720044.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/vogiritobivesozedonugemu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e42b4489e6d482ef4cdb6d0a00b22ec9/tuvetadavamona.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfa773a92---22255461469.pdfIn PDF document text
    • http://biosite.ru/images/news/file/49277658602.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/lugikalurijadizor.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/11126224048.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/46208736410.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/68527867790.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ed33b162a3781bc9e48e4ad6047cf89a/33960981864.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/82788745537.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9552102ac93fa52dfa221fce5b52c688/ludopesemumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=olfactory+pathway+pdfPDF 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_off0000b5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C2 10444 bytes
SHA-256: 7f441366b0c57230140ca368cd98624d1663c9222353f800732abd41e9b011f8
font_01_sfnt_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 15920 bytes
SHA-256: 8ba2f62483d148b7cd0eb8d2497b28b8ee9488713274b11dcef47e627b588fea

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