Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39803e507aef7ba…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 16:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4215a9124c38a4de8d824a5d413ee6df SHA-1: bc18d31f5d5e4e58eef97e1d68617b6e5dd87c38 SHA-256: f39803e507aef7bac2a9bd8af94ce0ad2c866e5142b2f06062f5929eb677a30b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://tommytest.dish1314.com/data/html_editor/files/50579130226.pdf In PDF document text
    • https://fallsplat.se/bildbank/file/dudik.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/sobap.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/33551d759aa8335cb2876455b7da2dc3/65573916781.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/76774504559.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/50578963654.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/23507381547.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/82671144178.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sivovefulepi.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/25403567137.pdfIn PDF document text
    • https://ratoempat.com/contents/files/81528797412.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/86793287713.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1390193c2abcb9822679b2fc10a3f91a/11348924899.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/28507395924.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/63370894649.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/bosiwubawo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/sumizuge.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/25721208049.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210905030051.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/83799954571.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/90253894259.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/20538529738.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e64e5beacea00d5ed013d2b8a14e9e9f/83133507932.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/48625235164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=modded+tv+appsPDF 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_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 17384 bytes
SHA-256: cacdffafa17dadb8a27b40c234240e9efd9e926a13da361ddb34a66449a5c9d0
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10100 bytes
SHA-256: fbf22e485bc7998d12853ee1e1c79020c28b5aab8222ea6a2c7d72132a91c6a7

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