Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e850c7e7fd3a62…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 22:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8f26ff29e21ae563d264ecf36d4cbab SHA-1: 759ff8cc4bdc3e2fe89116c04bb2ef2e4bd3a2f9 SHA-256: d0e850c7e7fd3a62fe3a75a0ad1af918fb935b33ad180e968fd8aa8733fa9b18
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure and the nature of the URLs suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e07454a45---96837281769.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df3d8d4c1f7---30941839538.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dekuxolurekos.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/80474787029.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/zejevopogazovepomuguwo.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/64357538534.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43280320814.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/dozefolosekomimoziparamu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/lotul.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9a929aa0e4990b2b440ccc03297f673c/65280703728.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafcb0d68a---ziwarovew.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/00eda8f62f7f3823c1e0cf7241930a79/52397199349.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/rizerirewegi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/15360634914.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/77417238032.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/agsmbqgcb7pq6f60ev8jr4p0ep/71044723261.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/73746868570.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210719_ECAED019329853BE.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/regikugekuvubaxib.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7f75c5cba10f14e064c043ff3b6c83a1/vidumi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/32929360043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=agreement+between+two+companies+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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 11124 bytes
SHA-256: 6760f8ee683116374e476563f5c1048774682b7ac2b61fb2e1a23eeb0719b5c7
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 17308 bytes
SHA-256: 308f0e71c4cf9ea7dd0ccc9e0b92f77cf8e33a104218c020a9dd92f63df765f0
font_02_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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