Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ab8d12b92bd11…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 15:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 420fa8319e7b7920659d20126813cec5 SHA-1: 352c62b45798935e9fb41c9eb23b57d8593180ab SHA-256: 544ab8d12b92bd1190d776e278597bce74bdd0ec5b30382d88aeafdff3b280f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fe350f99ae09d4636c8ad6348c7f8d4d/riverugamevopadajopi.pdf In PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/70324824121.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/81219881000.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/18951156235.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/5221875985.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/036cbaf905dadfb308af6bc14f63bc1b/taxavudosuratifo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/acefa748ebecd73a13b2f4c7b71bd28c/xisizedi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607924fa69af0---50668729048.pdfIn PDF document text
    • http://langyupharm.com/upload/files/napiruvudavizusabo.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/40580958828.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075491b1b78d---72588522338.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/36325214418.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/16594392053.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/18933494654.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b257837e83b---lizuxapanike.pdfIn PDF document text
    • http://chongros.com/userData/board/file/76574801100.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fepeto.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f22c322c353---60694997972.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/nasusapesilatalemitefo.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/wezukazoziwemagawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=articles+of+confederation+worksheet+8th+gradePDF 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_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 11124 bytes
SHA-256: 6257560fd79ae0bd639266ad6345983fcfca6b6d922c5c18b2b7b15e785bd593
font_02_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 17636 bytes
SHA-256: 4d097ccf5d75cefa6d4fe1137af70ea67fb47dbb49a49ce52f5b375dd621bd66