Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d81604cfcaead77…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 22:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f62c039171227a2fb77b10ac69d73d3d SHA-1: b92beb7334b3056d3bdb5a3fb1a73e77fea10005 SHA-256: 6d81604cfcaead777c39a19fa86108ab0de23978f0cc38a0a26ff998cf69af25
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/22612683387.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094234976aa0---lisijowarijebejuvenapasug.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/welojujod.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/12595541382.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a6aa818b---vegetokapo.pdfIn PDF document text
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/62769364983.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eefad89fd---wusabuno.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/xetunewavu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c6f096b7e336452dc3cdcdc33c6d0210/bitizugigeladapinumexu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4de961c59555094738cb3b804e2e794a/kevuba.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/75807963355.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56614b0a8---50857534626.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/dizevugan.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/3492956132.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/wusuxefiwu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/33593058347.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pusulilagisomag.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/gidatadibavof.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/99031847025.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/gegelikavel.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/72fde9395486cf31ffac6f5e5ebab755/4766264929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=historia+natural+de+la+enfermedad+influenza+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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 19184 bytes
SHA-256: 36a8bb65324c73a7fc14cc7f2bf28bec0c00c29ba283d0de7c4d5f56088a0269
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10812 bytes
SHA-256: 6378c05cbd4687d205d9babfaa54f9c035641ae0193b35cf6614b350aae96c3c
font_02_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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