Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c193d6b9b0e790…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 18:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fd3f361252e808dcee68c61bf556284 SHA-1: 1a339fadfe2ebdb9861b5e7b821723e02db25ded SHA-256: 32c193d6b9b0e79092d598e864dd345e77247499527141ab102a8efcffd73436
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://edwardlankin.com/clients/86087/File/serobujufokega.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/16ed05a20891037c90ca7548f1a217ca/bexap.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210712220204181.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210702033202118.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/garazafomax.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fekop.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0811/ec69493d11920df9225640ddc705bf1e.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9adc91019f46ee9567f4cf88f6c6cac4/83539035334.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079978c7b8e8---38345235943.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/zuwibefikonefutupenanid.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/rejutem.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab4da63108---79969329188.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dfe1c168---verowawukolawe.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a6fef740db7c3309405b6b9ba08494f/74258232903.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/sikoligil.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/2998187944.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70e67601c---tusifa.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/335640180.pdfIn PDF document text
    • http://teplospectr.ru/images/files/84059727415.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294d5625124---78673244032.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/fibibitazodute.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/31319374788.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/655a75ed12d4aac9148776208ee10900/73360499481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=operating+system+notes+for+bca+pdf+downloadPDF 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_off0000bb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB25 11328 bytes
SHA-256: 4ef6149d9ceed433168fe50238e8d85f0c12188f6ad1865a7da938af9118edf0
font_01_sfnt_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 15316 bytes
SHA-256: 359709c152756b00d20bcb84c1b9d8464090f308e88a8473f8b247158f8e995a

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