Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1ce788f2d8e7e2…

MALICIOUS

PDF

78.9 KB Created: 2021-08-30 17:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70f614c2a574720fbcd51fb38d6aec2a SHA-1: 904d780cd746217b147a6ae6dabe573094f9f259 SHA-256: 8e1ce788f2d8e7e26a99460502aae0e7026ae4239ec9474a0b07346ae30f1c75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are associated with compromised upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://successalpha.team/upload/files/zowukisopifewuzagojame.pdf In PDF document text
    • http://iltorg.ru/upload/file/75832670072.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/zinaresi.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/99039782504.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wizutuxemabavobusu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210815034827.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/f8dadd9944766d6d0def44dc5b351610/kojikejagepawanegege.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/62407016753.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4ac32d2f2---perokupumubefawapufixuw.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/mipakori.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/nafizulabo.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/zamejekuj.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/davulobabisepazigabo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iqr84sdhss2uagku4g0o3r91sc/jedezonejudixire.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/daae1ce2b21fe847474ad4afc08891d7/35206015077.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/4810292746.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd18f83cf9---31555451412.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c22b959e6---gubefusamebewevek.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xevugit.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff3763e62---41200294911.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1886e2b57---26139503112.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/16586532067.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/16039806814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=anna+kendrick+just+singPDF 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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 10684 bytes
SHA-256: f9c1f134f635d6a58a1944fa9c5532c30495bb236c7bc23887e1dec4f47e460c
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 17892 bytes
SHA-256: ce63424b88ce69cbc6aba76a97ed55b730efa6e2a7d4d8a631311aba9e612f1f
font_02_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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