Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5fa24d86cd0a1e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 17:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eef099676930c7697de441309b46e63f SHA-1: 8e10c0e794c224839e1fe9482d97940da95599fa SHA-256: 1e5fa24d86cd0a1ecbd984cb2f9cea171e46b206bb2475f5e0a1bfb9c9fb2f26
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and numerous links suggest it's designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ck-tct.ru/userfiles/file/59735755813.pdf In PDF document text
    • http://kammatrans.com/userfiles/files/65495384341.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/75283812045.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077862baf8e9---73003492051.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/naniloganemul.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d5b50183---4291382241.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e777316fa11d8d487eb4197639df6953/62449098231.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/61203122154.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/23678944969.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/bimiroza.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f719309317---jezuretapiso.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0dad0b017---ratuturepo.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/zakimumokudiwataso.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/zegoxetiwezokabivomer.pdfIn PDF document text
    • http://aven.su/userfiles/file/99285707298.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc414b9a9---gawipoxajefuwoz.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522071004197.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/33140877314.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ol3m9ieukffvsa35nfif0g0c1r/luwobufiliputisiru.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/28000005001.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8b36e71a---ribiduse.pdfIn PDF document text
    • https://posh.hr/files/5288433298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=neuroscience+exploring+the+brain+3rd+edition+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_off0000ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 11392 bytes
SHA-256: 5d584fd06d4541457afdbe4650ea4f23848389d7a4834630ae413c2a1571bb60
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 17856 bytes
SHA-256: c6c6f878c76726d3bf867196be43d7ba53bc7da8f97d82a5dc8c14d53c0ef982
font_02_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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