Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e3786b7c98675e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 10:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3611270b16967310e48678890a4fc507 SHA-1: abe275fbb99707d866cd36c5890a8969cee3be64 SHA-256: d6e3786b7c98675edeb63a6a1065422da47e7ca92673bc8c2a6b0c7c3f71bc10
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. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the PDF's primary purpose is to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tradeweb.es/userfiles/file/miluwemimazorak.pdf In PDF document text
    • http://mexxeopaint.com/upload/files/6682831268.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b00d2ca4fe---46032969866.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/11382365193.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/girufuvogenowikaposak.pdfIn PDF document text
    • https://gyvatukai.manovonia.lt/images/files/6040758231.pdfIn PDF document text
    • http://centromp.it/userfiles/files/vijidojumudirod.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/83581300935.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/gegizanetefinatibiladifi.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109151257018603.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/bikatumedimutux.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee746c61b8---80088280756.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/lebipapagobijul.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/tabanubu.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/difebotakolupegemazifir.pdfIn PDF document text
    • http://langmypham.com/luutru/files/67897421077.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/74287705428.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/afedf3b63012c4bf6fc076fbac831b15/towejonunevisidemirebuji.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/41612734776.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/roxilab.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/8990881901.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/73268908040.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/33418453361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+game+booster+for+pubgPDF 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_off0000af89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 16440 bytes
SHA-256: e838e4658429d6879a18ff44e1862ee71dcd412e07ef5adf4a1565071c722a77
font_02_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10752 bytes
SHA-256: d13f9d32a66a68183a79cb82948603a887386330fa17ab2fdd5aa41a5b799240