Malicious PDF — malware analysis report

Static analysis result for SHA-256 c439f5b9c11e58ea…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 02:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 34e42a4014ed5a783582f9bc761b8cf2 SHA-1: e9bdea8ad5d971c78ec5f4dbb4d952cbbfd1825c SHA-256: c439f5b9c11e58eac655594d2f845feac9c7356cfc430450018d83cac706783d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains, likely to distribute phishing content or malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01168c862---32629208535.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nafagakuvanumigo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/80784247734.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b10c7a16a---5763982072.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdcfc25c1a---55631452878.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vimugibi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083073e85614---jekidimexevemow.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bqd0lalq2ij1t1r5c6q03vo42b/mumogaluvemivuja.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/42e39d418efec92d1e82855306ff948a/lexefopaxefamuzigebakubu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/27339403311.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/60331220594.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b319249b827---sisalatadasajamudawax.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/59078824157.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e65c09918a4df872cbc8d34b8d4eb972/sumezoxokama.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ff14ac33---53707710251.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/tudovoguwesusibu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t71g3pvc4lv6e723n0k68q5sq5/80946402488.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210618102521.pdfIn PDF document text
    • https://hgb.se/filer/file/77403683519.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/8332923239.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5aee6a424---86211659705.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/43912899068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=you+should+let+me+love+you+let+me+be+the+one+to+give+you+everything+you+want+and+needPDF 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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 23388 bytes
SHA-256: 8fda88a8460b64cfe4d8dd51a847687426de43e0f52f634afd1f20148806821d
font_01_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 11184 bytes
SHA-256: 31ac55d14a894b82928d181a036184dd77984856f40514072730295829e940de

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