Malicious PDF — malware analysis report

Static analysis result for SHA-256 6031ea6724f8d9bf…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 23:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 936ad4b95afac9eff82e62a5ad83cb35 SHA-1: 5f6a1a74c3b55ef344207d542131edcffca1a850 SHA-256: 6031ea6724f8d9bfdf273bab733153bd5e8a91494a1911690a19993eed875c98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://vorne-sitzen.eu/pcms/content/file/55979908348.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4b924e810---tamigurejojesoguvasememo.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/bovopomogin.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/70363646447.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e7367eba---laxuto.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/11511727208.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726da192018---40967597811.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108252029406047.pdfIn PDF document text
    • http://healthywithhart.com/res/file/7863960744.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/63245049417.pdfIn PDF document text
    • http://zzquansu.cn/d/files/7042153187.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e93deb454---48790355865.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2ca23cf78a626a64c00f03d5466e1531/16127549424.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc745cc95---91537122765.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/regekavosugon.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/89915777652.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/satekalesabojav.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/54096144322.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/bakawetijilogikiwonoj.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c019d6572bcb211e924f75c3b855f6a9/buteza.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/pifedununij.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/kirufujiriniduk.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e5ab36a1d0ce514752581a9f53b78549/pidorinotetiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=volleyball+skills+and+drills+pdfPDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 17316 bytes
SHA-256: e90964c0624429a12b7e5ab4999441c00902d93cda8ef2a1bba0be9462df81fd
font_02_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 10708 bytes
SHA-256: 34205c7a8ac905fd62d2f9761f13e0726478e956ca9d1a1c1ef90dfffebca94e

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