Malicious PDF — malware analysis report

Static analysis result for SHA-256 2839b4e90b589168…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 07:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b78558f4aeb4d12e28999840db121bc2 SHA-1: 717319639229cfd0b70cfaf23ba9184e419cd0a0 SHA-256: 2839b4e90b5891685d3f81fdee084833fd19d056e3c88d3ba618c1e2c0d68774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that this document is intended to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/8a179f3a2d6bb220390faf26973bb2b1/ruxigidavilofaburamepuxix.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/be9c193278ed4308cb041f3b181df385/23574905633.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kubavesil.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/m99k695jojki60h6crvdvn4bm4/7637603282.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/32020592133.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xewagefubulirubifiv.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39f71b2bc1e36adf4d15b3472865cb67/dekaxunodagu.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/naxijiwibubuwugevitures.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/mipowakakibofofiraxusuv.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/63697687822.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/16813281996.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/bebikelasa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff55a5e43---tigoxunulotasugi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4db062c68---gikuposogak.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/99448081148.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061606174280554.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/woguripus.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/belisipafiwokuniruv.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dc2c4e78dda394698665a6f898828bdc/gurininisijipifufal.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b5698c787---59808560530.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/kesopekadimemig.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f51165c263ddb66ab30a9527d13c998d/juletujisikajidobed.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/77a6125ec231ec5e348a6bd770214075/fatavan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=australia+map+download+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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 10692 bytes
SHA-256: 76e5442bdce754df26f6f7ac6f0b1b67402b2e23b9425b0c9b1acd8139c418af
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 17784 bytes
SHA-256: 1ab545075d6669a311f71ac38c0193bae346548459f083ec5c7ddd0ea45f729c
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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