Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed3e8a3d974e6cf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 06:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68faed58f994b6cd86aefd6c32378dc6 SHA-1: 9d1587bd0caa2c7b5440b8360a40b7c622d165b4 SHA-256: 9ed3e8a3d974e6cf3340c1e747fb90a8b2f76436ceab8d9c3cfeba13feff381f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=reading+a+pictograph+worksheets+2nd+grade PDF link annotation
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/56qnmlbr7h9bma3ref4k586js5/58646345992.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ziloxelobisigilagusu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/suti1d1ugmsqlbt584sclsfsgv/1880306054.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/570692143.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/bilipegufebisebu.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/85310927989.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/28388807134.pdfIn PDF document text
    • https://nasikampung.info/contents/files/35860813661.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2930c5ba288237dbf4c00fdc2ca75773/61119299175.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/putivuzisadefikinudowuna.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/wapasazas.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43416294812.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bb9f1f4f9eeca7e4bb318fb4d89317c/fededavaxuviwulalo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160819408e5c53---84553014261.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/9449512333.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4ab310a0099babc684b0431698cd9e07/80660175360.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/59025165772.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/13054502822.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/besebagiwemisubo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6fd9d05---13736502182.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f92983ddf---23823463461.pdfIn PDF document text
    • 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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 16444 bytes
SHA-256: dbe0e0ac6af8d739ffda1e0e6abed962a7ac1b257a92cd9e86717c33aca2a6a0
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 11088 bytes
SHA-256: 0bec1c3f7df02f9bc2070733204f9d3b673e00811623b86ea941954d9314857c
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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