Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25cd2586fd738a5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-24 15:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60cfbc691175d93c1a9cb03e2e5b2c30 SHA-1: 8aed2627828b9dba9320f4dc819d05ca33df5257 SHA-256: e25cd2586fd738a55abbeed1af09b6bd937a98e0599221367b4b45ab633c2762
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://exhibitproplus.epponline.com/mentorfinancial/page_images/file/viwuvoluwif.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c9b85c5---68492214992.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/tukejirezepukekox.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/benamalexibej.pdfIn PDF document text
    • https://olterus.com/contents/files/42764979221.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/62038380657.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/fusuvusitapemerevisazesa.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ba4496fc---30300753739.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fe1d4718b3fbbe4e9963d1bbb61f76ab/77587069622.pdfIn PDF document text
    • https://basisnomor.com/contents/files/2135488835.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/90827564902.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/38950028299.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/fenopepoxosamaxupot.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903095930.pdfIn PDF document text
    • http://rts-3.ru/upload/files/23982682229.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/sikakiwivubidugeno.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/nukuvaz.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/34216399184.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8224937c1---dizunat.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/87782205070.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109111243086509.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/43906372715.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/nozolagevulagoda.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/60660373157.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/18720100166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=exfat+android+tvPDF 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_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10152 bytes
SHA-256: 9ddea9f29d97eb51222a875272b1d1abad95396715c61f3feee07ef33184f4a6
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 20880 bytes
SHA-256: 1d3f95450898195dec1a04c4d9b4c5ae08f71bf0f576f4f1177e2b52decd1eb1

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