Malicious PDF — malware analysis report

Static analysis result for SHA-256 3832c4f028249cd3…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 19:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 56fd7c3f40f591a268a89d179516197f SHA-1: 2504ddbf231850a103f879479ef4a7b49e0c9380 SHA-256: 3832c4f028249cd364e8b2f49f69106f5f8223dbdd369ddad8bf1ebb0f850302
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure itself is indicative of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://changdahk.com/upload/17693181753.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3cd9826e---79975347532.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b6d7d8e626a9471f432a4fe8016928fd/vigubafonufezuxezoparig.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1e0ae99c9956d4a992f090b4ff5fdd60/30917980858.pdfIn PDF document text
    • http://195exim.com/datas/files/21254300733.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/feec8218b4b0dedb72dce9f2fdd32d2c/jodovuzarezezag.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/78a1ed2357fa2d8620c468eea6d2f9f4/61235962450.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b23b349d1---joxumen.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/95a10f14b23639db406e0334d2edc38d/mofokibajez.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jutowibiwa.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/lirejonenabesizo.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/60406095425.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d0d365654d9254258f01db154dc35c65/lodepugelavelobejamegopuk.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9ed750ab---27236571276.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a58af35ca---zoxuz.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/sarubefo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vewojukinolupelupepup.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05ad2f947---gerekogo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a9114b91---wumawejo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b60bc184680043fe7cee527599eefd67/91376252976.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/58vduchveh95l5qfo1h5v1d5p2/tajutawizanogegufob.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/rudagovejimurimutoki.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/36724001370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+shoot+your+cum+fartherPDF 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_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 17428 bytes
SHA-256: 38add3114a90e9cac7d05cbc139c80be9dbad65ee719c66d573ceb021d93dd0c
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 10652 bytes
SHA-256: 69c3b27265cb12d9be38d3e698048fc6b670e7e82537094859a1f39ed8af55e4
font_02_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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