Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec1b18a0ae52a78…

MALICIOUS

PDF

70.3 KB Created: 2021-09-19 09:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d4dbe5f4d75bc1c62d6e72e0e01e1ed SHA-1: b83a95e4138c272d83776e9760d0b30b77f3a35f SHA-256: 8ec1b18a0ae52a786fd028baa52e1bd9ff28fc6760eba47a0545fc6a7033fd58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gf2d2tiih5tcijcda7condv1fj/solinoveva.pdf In PDF document text
    • https://safe-international.com/userfiles/file/riner.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/zijediletarixutagarazix.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/fekubodan.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417cedac27a---ganise.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/libohmncsf01fetqa0dq9qq1ak/37874198112.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/vokitapopibasora.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/71294686998.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc19a5226f---82877012245.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/mejorejijajakikuvoju.pdfIn PDF document text
    • https://expomediainc.com/upload/file/21119873213.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/25693586922.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1720b35bc---53591647859.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/42958435756.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/riwopo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/kapebivavojaxum.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc70bb2dc9f995ac943cb1f9624ba662/24534305425.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/75298629300.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/kogosadipovukodufon.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/vunami.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/65949269092.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/2534658723.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/povuxi.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///zaniwezoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=anime+wallpaper+in+mlPDF 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_off0000b48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 16008 bytes
SHA-256: 3b796df48b57aaa62a692a5e18070b1a7b020e37e82bc80659d405c40dec3e1e
font_01_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10096 bytes
SHA-256: 11bcb139ae8a4d2d99313ac1033cb6a29e0942c683890cc58e8808c0f569648e

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