Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ff20a97eda9f79…

MALICIOUS

PDF

93.5 KB Created: 2021-08-07 17:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a3066ee4562b9c77001cb6a1a001d16f SHA-1: 66570d41f2a0a062c507db5c2446cf92a70451b0 SHA-256: 25ff20a97eda9f79a0460b28cfd5ce153368a530329fad4a95bf202b451f2c5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to lure users into clicking these links, likely leading to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://coretry.ru/uplcv?utm_term=how+to+clean+hair+out+of+bissell+proheat+2x+revolution PDF link annotation
    • https://pezenasenchantee.fr/userfiles/file/44640560524.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8a7c65ba463883cb474d0ef3124327ba/forosebomu.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/lasokedosafex.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/82476282160.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/27037125204.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wanupusepedataden.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tofaragonisiboxipijure.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/12552790700.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1baf69d6a8---pawovod.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bafenonimezasizem.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/46590362859.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/2048208518.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/jinulekip.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tajosikatet.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867489dcfc4---roguvojiveropodoge.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/tuwef.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e23dd8996---89074903755.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/d91ce68aa3bc87692cbee43e36883c2d/26653152155.pdfIn PDF document text
    • http://russia-ex.com/67116753744.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/zakeziditin.pdfIn PDF document text
    • https://o-dance.com/upload/files/rilebidumepemoveru.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a773ccff9dcba7077152218fc292d7f/gokeluku.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a505a09303bd18a46c801763d65574eb/mokotafebuba.pdfIn PDF document text
    • http://apsons.eu/files/file/20166144068.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/raninuxis.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lau6l65brinn04ak66uh8rioik/73295362135.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 17136 bytes
SHA-256: 2418bf352a40e4ffc0095343c9836b52e822c8be57407abaf9da49a3db4333ca
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 11184 bytes
SHA-256: 9a0f57c2174a2ab10e0b2149ce995d1f92bda283761a23b185d59c02148fb5cf
font_03_sfnt_off000150fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FD 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40

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