Malicious PDF — malware analysis report

Static analysis result for SHA-256 21720a0777f44f54…

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 00:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 484e8c6a358a896483733d6076a56e88 SHA-1: 6f8817bfbddb0dc54b5a47c42482485ddc7a91b0 SHA-256: 21720a0777f44f540419feedf48b00e199ef643add3e5097dfb3deecb08d8639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

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 http://szyldkj.com/luodan/images/userfiles/file/40889298173.pdf In PDF document text
    • https://queensflower.nl/clientfiles/1371270946.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/galepulafikagalusajoro.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fde820a0a---bukiludezavukekab.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff1bb3f9e---kepunubirimakuxe.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/rutunesa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072003f23e25---bezovidulu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedb034340---fizamaja.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937793d0287---tasofefoxikedapedofirek.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ca1c9f17---niwesijevipozido.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02a4b9f421---juvuxaf.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/amgena4790kt658v0hpogc9lt1/romawapuniwebefavomesuzat.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/gakobudemuvobekalefadebi.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/38233169920.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078906e53005---60909651558.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/28722786826.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/85481015217.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ea55ceafd---gofenonidek.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/gopiliteruwitu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160907d66cb0ca---64823583919.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/90371496013.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8651592---vovofuzefetufifep.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/183gntmepo35s4sho6vhe3euhc/42100126962.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608801e1aa4ea---63212264818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+difference+between+cold+blooded+and+warmPDF 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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 10960 bytes
SHA-256: fa9afea480fe3aca445bb12365201ba5338d91e3969e2a9d251f8add184a44ae
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 17052 bytes
SHA-256: 989c0ecc704038071020a001781c1643a715e1d200da58bf63124ef5b29b3cd9

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