Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c76f52654e1e8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 22:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7f28bd796a5a86b3add2acfbc439c92e SHA-1: 333f8692538ac10c8424b7ed5e0e9705eb4be349 SHA-256: f41c76f52654e1e841e21cfdd94637fc22649025540e879fead5c46ef6d54ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=ibm+spss+statistics+23+step+by+step+pdf PDF link annotation
    • http://devveb.net/userfiles/file/92842997493.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79f51937---xataviridilit.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c720d37575302018dc078507584f71c/79800302855.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/2300184759.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe41330d8d---gejolar.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/koxibuluweru.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ks6sobu3oitqia193cjsseqnb3/rivunarasubax.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612b300ae122e---77655498083.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/17sjfmd1k42to34a30ud58c7v3/dovofovawifo.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/3866275992.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/23391850231.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/n8vdbpvvlimbqjv1isi5g0br9e/82174159437.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/goremanuso.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/surozem.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c4016a6dd9ffcc673b20701e9e3b82f8/zemujasevokegofadikini.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/17929812050.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b649b56d1d5---lugaga.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/18cf79df563404ae0695d2a52f7d607b/tolumexewavarobafexowid.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6a1a7f35b66026d76dd8ed9c01982ac8/45815301168.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160853f85a0647---25149098703.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/84231569623.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/57682157846.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g8n568lm8olr5a3g7hbsupvkhl/42558728115.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/numivolu.pdfIn PDF document text
    • 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_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 17124 bytes
SHA-256: 7ad711ec0ee6dab95c9224bda9e5f72f2cd80934f1f0758c34f7126551a8602e
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10908 bytes
SHA-256: 8f569a48ee0717edcfa3c7cef052fdc43203b8f676670c75df9d9414c20a48b7

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