Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c842fd3c68ec71…

MALICIOUS

PDF

116.6 KB Created: 2021-07-05 04:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9201f0eee7319cb5f1ac586a4a2239e5 SHA-1: f037adce64a31c8daa6ac8c91dd84fe8f2b23ec0 SHA-256: 08c842fd3c68ec718cf0f443d47c8337f4d1a9aaf8c9e15ff132a9f360aba612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://dlmberatung.ch/userfiles/files/tamozatovuzibaletinigurik.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4eff36145ce9eb61e5f9d648ab9b8550/mudolovesafiko.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210623_068A7FC011891479.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/71fd55bc783dd83e5652ecbc93493144/74572563034.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ea6695ce---79835325729.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b00b1902412e08402fe4c86735d3f116/fupamavepalukudabisimi.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/katixegoge.pdfIn PDF document text
    • http://agavietnam.com/img/files/44246462639.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/22015584314.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/31227220432.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2ba2b3b6f41aab8b6c9fb486664ad51c/3462995381.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lariw.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/luvisiwenuporole.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fugapuwov.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/miwubizolasazenivow.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/74443259359.pdfIn PDF document text
    • https://t2sc.me/userfiles/95075598720.pdfIn PDF document text
    • https://tsegypt.com/file/jekozegekoxe.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d23ce11b348530a45aa1e380673ca564/20374841188.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/rudikunudorugedewuk.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625436355dosirinemexidosat.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32b78e1c7---8038114840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=black+t+shirt+mockup+front+and+back+psd+freePDF 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_off000161c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C4 11268 bytes
SHA-256: 4cd388c5e49c73fb59d4d36820249c4a7f9d9704c6d1253016974e684a09b13b
font_01_sfnt_off00017bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000193f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F0 18856 bytes
SHA-256: abf42bcf0c3dfd6edb7ca1d641983b8ca4c5a06c7b85d13677c07c0b2d579f24

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