Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c04593c1d31b863…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 06:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 542bc162c212085049dcac6feab68d02 SHA-1: 726ddba3bf651ca0dac3420a69d2c50caa070be0 SHA-256: 6c04593c1d31b863a699a6fed0b38142539cc5fda170061745ad245d70bfea6e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised websites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 6

  • 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
  • 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://aldaserwis.pl/ckfinder/userfiles/files/lifejoseta.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337088937b2---dusuburikagedosinulaxobow.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/jorugifivet.pdfIn PDF document text
    • https://majubesar.com/contents/files/satubugevujunogofumar.pdfIn PDF document text
    • http://wernitznigg.at/files/9104289562.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/vudowezojolokulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a61ea9455---78849163469.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/bisuxolesidowaxofupuwu.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/balemadelubamiga.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/tuxesevetafidutanurujad.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/55128416020.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/63380436574.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/67498850924.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/pakikalelofubaxex.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4b8c7a5c4ffbe28c3b0cce1bd7d14a65/8866481347.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/32075261709.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/30923797297.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/79677122110.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/xafopobukopilavixejasov.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/84911424778.pdfIn PDF document text
    • http://nemochem.cn/upload/files/64732234011.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/rexafowoda.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vonemurepotowolokor.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/gimugisefigowuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+lookout+vs+nortonPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10188 bytes
SHA-256: 82ba1a9510fad5e949b8e6239958e09fdcecadbd09b8d60e5e171d2536dcf057
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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