Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd34bb97fa89a253…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 08:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2425b6ef7b058ca793c332d5d6e63b41 SHA-1: 2e22773f1b03f455d5c138602cba23ab80fbca32 SHA-256: cd34bb97fa89a253f1bf8e482f5302ca126d9a129672b05324d53729c8518c70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including a compromised WordPress upload, suggesting an attempt to obscure the final destination or leverage multiple attack vectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://honghow.com/ckfinder/userfiles/files/93826458469.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/46257973671.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/30534679009.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/unj90hqjpld6modskthvd4med5/84242090687.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/94799293635.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/vidikomixizolukesobuk.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/86084494584.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/88687013498.pdfIn PDF document text
    • https://chpcentre.com/files/file/bikenozagazarepuxitisi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/45358825939.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/mosezo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36752a9c0---55587336745.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/dunoxelirafozibasatigi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93b013903c0f8bb2d5f318fa4f5b80/74468059008.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c025a71f1bc---10453691013.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/32023757683.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zijamasenibenisar.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4320810ca4b8da663c59a0c4c045da1c/javifafagerisumovusurasef.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe528693c0---6105901124.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0816a2f6e9e37633d0dbddf60d59757e/xipoximinaxeso.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4736461450045de4f8134b98fc3d3315/96628456761.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/bilidedalun.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f606cf0f---kosabojejitiridojemulimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nist+800-171+compliance+pdfPDF 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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 11124 bytes
SHA-256: 7e3a77f599c82c00ee69f175106138cc6ad6ae1abe1fbd282b2b923fd68b02bc
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 18388 bytes
SHA-256: f738d2492cb28cce81f55c18c199521895e54bc0481039e67788b200613fc12c
font_02_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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