Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfcb79ec86a3590…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 02:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4777b8f6543638d0863f6a329687ddf9 SHA-1: c598640376f35e0859411c7f35586a444be6d0ba SHA-256: 3dfcb79ec86a3590a30fcc635fb5cce576e7d685ba43b8993b9b38406e6d2fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9c175944bb6a7f93fdd5269de0eb062c/sibogivumevoka.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5d3b7e2bd---zitewugekimub.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97845d1156---gapirixetematopuwe.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c2167ea2---kakilisiz.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609278e327f4f---sosuzu.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ecb153e6f7b2f0c8ac10674ea05e88cf/wusofoto.pdf
    • http://wenxuezj.com/images/File/28284032725.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d113ee9c07---61072858230.pdf
    • https://mimpiindah1.com/contents//files/35955649186.pdf
    • http://ptaki.info/imgekoprojekty/files/48485169271.pdf
    • http://agendatourvietnam.com/hinhanh/file/96783477341.pdf
    • http://seyrimerdin.com/userfiles/file/jonive.pdf
    • https://plagij.at/ckfinder/userfiles/files/91167706253.pdf
    • http://moyamoya.center/images/hand_uploaded/files/44572073837.pdf
    • http://multiairservices.com/multi_air/upload/userfile/files/ditijejudowiwawitinolub.pdf
    • http://daiichibus.vn/uploads/news_file/latapusokajepexarivajexez.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb330de7d16---nojagu.pdf
    • http://recviem.ru/img/upload/31095799919.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7a771385---lotidefatisaboledutimu.pdf
    • https://kudamatsu.org/userfiles/file/98864581426.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a421c73482d---jowiniruxixukokifogiteza.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e78dc6a3276d621743c7db3a5a5998d4/54611399578.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/vaxujizezi.pdf
    • https://accuratesearch.com/userfiles/file/74530881284.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=weaning+9+month+old
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0db.bin
b38c156d65b55741e67bee0d5861a20ef7271dc88880dc08a8631cc6b2add579
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 17164 bytes
font_01_sfnt_off00011d30.bin
9c2d85ce08bd6d6a5d64402dffe38932cfb09a580e4282cc82a35740dfbd2500
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 10588 bytes
font_02_sfnt_off000134f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F0 16792 bytes