Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a016d0bcc2f26df…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 04:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9846ac41052ff69e8459f976beb3ea02 SHA-1: c6c476ec7e4f1aba8011ce5720bac72de28429ea SHA-256: 3a016d0bcc2f26dfca247be026b800e82960079694e32b897045730c39a80c9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also includes numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://centromedicoveterinarioadda.com/userfiles/files/1141258259.pdf In PDF document text
    • https://morethancars.eu/uploads/edytor/file/87153987521.pdfIn PDF document text
    • https://onlinendttraining.net/files/81140624624.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/357fa09bc18cfd55fdd4824fba999dc4/todotekubegawolilijadax.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/gugap.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70714334648.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5cca52579---jasuboforuwezo.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/motubonulotaremiwawofoso.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/duximimikimuvew.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/99284211129.pdfIn PDF document text
    • http://360global.ca/userfiles/file/93213150892.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/atiit4t7n91sgm04fuoovo0s9l/2419019693.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/memuzovumofuzelopivaxu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/nafuzijafumokewomi.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/vonitudadoloxabix.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ih3agpmcllckutua8nn26ca416/17326334345.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/928761390.pdfIn PDF document text
    • http://babamoleskine.com/files/file/vaxeroloxinupe.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/teferewizoxer.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da71489f4---betewiragukik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=matematicas+y+representaciones+del+sistema+natural+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_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 10988 bytes
SHA-256: 69f646b42ff32f1ed48ea58c688cb371dd2e0174c038185003ac22ffd7974f95
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 16348 bytes
SHA-256: 955254bfcdcdd555a54441ef9679097af7801eeec657a67ca97c4f1e7c9b19dd
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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