Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1585f507d82cec…

MALICIOUS

PDF

95.0 KB Created: 2021-07-13 04:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a0f6b608e88e07e971af1d3a57396d1f SHA-1: e3d2b652044a511f5c54b7c34c8d2bf46c662a9b SHA-256: fe1585f507d82cec8c4dd64c39029b13e6f584aaaa145613fddacee75d88499d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://motelandratecuci.ro/userfiles/file/pupoguzinujonuxutazuke.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/72398811807.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/99134013203.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8471a65e1a---81240285666.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fenoxigulor.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a1d7ad7099bc7ff5a58cb6e4cebe78df/41368733331.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d95274e4---butomifajasejubiloda.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/wufulakezagexafuvojexo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906695dcf42---35928621022.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/g8c2s6t68j4t3pfkl7rsajbbsp/67188934212.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vunona.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/4427856636.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099771d2dc06---dunid.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/89111561440.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/41be3f4a51ba0a252b7d41de7b40b001/31744508653.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nunubiwakujoxutewuwejilar.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/30626535687.pdfIn PDF document text
    • https://egca.fr/userfiles/file/midovepigopelutapa.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844543e4f4b---79006292232.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/gidupibuzupiruridizaju.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/78ad1db198fd10dbd2d3a67dc029a292/lifiluromivu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1o6eg4bcpjluu9ab4i524s7q1h/bexer.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wupifonopogik.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/gobun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=barter+meaning+in+kannadaPDF 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_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 10400 bytes
SHA-256: 65d8237b125caeb093cc6f92050ecba860b1d9b59daaad2cdc9dc2dd79d1e753
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 18436 bytes
SHA-256: 51ac39bd2d6d3de997851640e9b28e4023c7f7e61841d43bf37ceea8743e2504
font_02_sfnt_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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