Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa4037994e566a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 07:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffb88f556b2c69756988befd2c8e6345 SHA-1: d5a902933694505cb2a4e823aedfaddd35ee053f SHA-256: ecaa4037994e566a9ccaaf681ce34eefbb0c5d8b3e397b59659f21677a463827
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggests an attempt to obscure the final destination and evade detection. The primary attack pattern involves leveraging these links to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/affc91fd6350b6faa70b9f5c2b2d8eeb/23484327754.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e6947663---83126916614.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ufc07fqiuq11fnp51h7vs0kulr/birojatesexijitazijigi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0671ed05585a0255a7b8e4df15191fcc/benovekivu.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/ziwurefok.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/fewemefuradaxewul.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/672c3530f9b6d762ab5c1153811559b2/7502995188.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4ba6cb98---25249697673.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumojonusik.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54690128356.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/xujanobufa.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/51467708179.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323194c2e9f---tizip.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/xipokipinubamevasir.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kop8dr31h7fhljuaftbd080p04/10824307199.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/39246967789.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/supedomunagubipetevizup.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/jisisubobirovesuwew.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xinepewo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/65777340100.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf453f447---95548151961.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/82296523478.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/43381a228dd79f84714fdd6e079ac8dc/malumasonuzevamixalorilar.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/63137628409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kobelco+sk75ur+service+manualPDF 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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 16336 bytes
SHA-256: c1195c18dcf072ffaca16c484f1a43c6894f95acf8632c046eccff01a7cc6c99
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10864 bytes
SHA-256: 9611c7756ac7d2a7808a37b88d5794f771ba2f5951a82d4132f8f3c7e8e06adb

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