Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0f621d9a2c69d9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 23:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 920590c1d0a6f36f30f86bd5aedc2501 SHA-1: 4c075b05015fed299f403c4895402f28415d5fab SHA-256: ed0f621d9a2c69d9c1f7f640d40df9cb7fc48da57d1e36cd565b19e8b8c08344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links for initial access, likely through spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=dissemination+of+occupational+information+pdf PDF link annotation
    • http://orgue-chantepie.info/FCKeditor/upload/file/1373407523.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h0m7i1o34ch5acn23rhfgjrsat/vevidenarafajedefujo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4fc2790d---11397995735.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/botenasegezafok.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/naseseguronaj.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b83088acc---gafajonurigagub.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/dojovovedaj.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/netodepisazifi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bc492a4b4bf056730e0d0dc21dc59556/3367997142.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/effeaa0c6fa9faf0071657deda1ae362/kawonovobipirix.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5830d84bc---dojoxowapiwufop.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/86843423813.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pubopezofululajorufomoxij.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/ratesumoxonodu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160753333aaee2---xerutupezesubodoxoja.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e390235f41---76396357189.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/96367495859.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8gj8335hk0hqgtpj0p5vs90s1l/bavufovezavemoniripelu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc0d90f5b---57759098696.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/42125099535.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/cb99976967014f064326fc3ccd2ce6fa/52545059705.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bopejugemonizodiruwewanik.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0bc5d1aa817b59ba835cd8fdc9ad5c90/18580713066.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83eded829---95879681786.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10884 bytes
SHA-256: 85720a5b43180dbee6e213d69372c35c6d2121c307c90a0f59f1f0df05ac937d
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 17208 bytes
SHA-256: 9251b2a3e47210a28b3e5e195f9758c5811e09ef962678ac72cd34a24e87e887
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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