Malicious PDF — malware analysis report

Static analysis result for SHA-256 7846f6cbbd3c6e41…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 04:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0faa9c93af1915886649f3b26a514f4 SHA-1: 2a18ce8d111b40947a539f34c95167b7269425ae SHA-256: 7846f6cbbd3c6e41624c21313dac91db73f502e06de489e4d318b10e6e6c1050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pensionpoint.cz/userfiles/files/wumipufikodeloginomumita.pdf In PDF document text
    • http://windmill-bv.com/userfiles/files/65726937087.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10485346610.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/3913873980.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/63719459584.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613be77e12488---65188734100.pdfIn PDF document text
    • https://maria-galland.ru/files/file/dapufalaxavidaxeji.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/gikeda.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lovekerunu.pdfIn PDF document text
    • http://samtekelektrik.com/files/nuxigowibunanotide.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/66093296634.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/12994019507.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614153ec0358a---77674318764.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/xepefav.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/41959047810.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/pavemojij.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/evie5afvva3ul7d5t43e1k8uto/34925122812.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/35600180291.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/45520523531.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/15077787656.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/38120184008.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zizaxili.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/4366991131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cara+mempercepat+koneksi+internet+wifi+di+androidPDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 10944 bytes
SHA-256: 56ea44930e9a95cafcba2b1e93b29a249a3bc836297999d469260a9a0c32ef32
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 16540 bytes
SHA-256: e7a36d418f6d12bb6a3057cf7a3ed68df62f7c275d44c93d7961f628ad7ed4d9
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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