Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb11c98b79469ff…

MALICIOUS

PDF

75.0 KB Created: 2021-09-28 13:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ea8b926eab8495b8661d45d078d2e4a SHA-1: 8d9af524b0949ce909073d7c7021a7e2e5576d78 SHA-256: eeb11c98b79469ff47525504924815080144423cbc13de8210c38c2594f734d6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The presence of multiple link farm heuristics and numerous extracted URLs, many pointing to compromised WordPress uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ngoinvest.com/uploads/ckfinder/files/zunurir.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/berelidobixutomujuxuseke.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/siwoxo.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lijumodopegi.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/79688763841.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/wijirevirep.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/doxisuvatape.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xixako.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/89cda3a4c9ed137294cb0de0f5e3e594/59424987773.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/68307444847.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/7675819615.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec6b8b4e1---56106854418.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b0c35cd02181b13444a32a305369f350/lakerux.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/51121684222.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/revesopej.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/linezajiratijum.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/migitabuligovemeruvokixi.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/miboxeroxewusilibew.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/41270083992.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/vemorukuze.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/83392239701.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/67737948057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+notizen+handschriftPDF 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_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 10568 bytes
SHA-256: 40c5c0ebd6ab29d809a90ca2b0ff8b634064f0204224223184aa0241650507cb
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 18608 bytes
SHA-256: a4877feccbcdb1cd838faa0595b12536956b61f39a93232cccbc5b9be8652d5b