Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b335ad0e902e8f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 17:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d563671055bc825fe008b4471857f059 SHA-1: 54e946ec7ae885f95bf4d5946b59d1bd84dc6494 SHA-256: 24b335ad0e902e8f92e2cafb6de71565bd13766c97bab5069761cccea0fbaf57
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure as a link farm is a common tactic for distributing malicious content or leading users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=penyakit+gonorrhea+adalah+pdf PDF link annotation
    • http://studioghittigargnano.com/userfiles/files/duvevatemavolimoputivut.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xibifovejizagadonul.pdfIn PDF document text
    • https://ivanamihic.com//files/22574366135.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pirabosirokekuzefinabisi.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/12101690897.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b89bee5be9bd8370d52ddbbacbcc8de8/82079938538.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/janef.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/39964368418.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c4rp0sj1g6k5d92ncodmsp6dq9/76239954563.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/lifumoludoselelatavepuzir.pdfIn PDF document text
    • http://adice-area.com/pictures/files/91369016943.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf9881fc5---60807263791.pdfIn PDF document text
    • https://hiroyoung.com/data/files/zobiko.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b77e8900ae45aec6a7dbff9e2eeec5f2/jasivuwijalogekeke.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/wutomibajimodinidevala.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2e757fc0201bf50fc499cc5cab656eab/97875809125.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6aba3b30---95024091243.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9c091f90---33897694279.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8f038d19e2338176e89ca757d11d60e7/94691605122.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f67f66e3dea4d4c9b209bc9f7c9fb048/48275242020.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/81150504253.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad615ba03---20348229141.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10816 bytes
SHA-256: b8b9205ebfca8bb99dcdfa13aea6cd0292bffc908ab1ee8fda8011ad408d9de3
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 18188 bytes
SHA-256: 737fe37b0efef406ed70352df24957b94b1ef0b00dc13a2f7552999786518378

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