Malicious PDF — malware analysis report

Static analysis result for SHA-256 443e0f5b48570b70…

MALICIOUS

PDF

87.8 KB Created: 2021-08-30 02:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fd379785f74adce6d399823397748f6 SHA-1: c4ac295f6e9386c2206f09012ebac516d8d96509 SHA-256: 443e0f5b48570b707da323a0bdcb15f61be9608562aaaf1f77eec5b7b67d9a73
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure as a link farm is a common tactic to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=where+is+area+code+314+located PDF link annotation
    • http://kanomax-nsk.ru/images/gageki.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/75492650553.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/dn5q5jfghmnorjh5t7tbpmp1o7/83629368185.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/35217134397.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/nikegivo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084424bccc4a---73991159598.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d54783b9f23---63153586944.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a445568d00f---73859492520.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/91746237734.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/77371900362.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/vizepar.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/a268sqkfeidp84ip6nmjnc8bvg/58942540972.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/lesadewef.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/76376916560.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/napfm5mo9g4mvcvos2s7coav0o/fakid.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611177e1a69ff---85193142606.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dejigogawuj.pdfIn PDF document text
    • http://kmsenior.org/file/files/96601275707.pdfIn PDF document text
    • https://kristinanamaste.eu/files/mipofol.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0d87fb8b---34920279431.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/67727060847.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/30862160904.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o9j3c9t2hfnjqkgedqhk4mb2i6/32575301094.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10d879228---jivavumuseginisirok.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b1e9e391cd17c5408656a295066a97b1/81912353757.pdfIn PDF document text
    • 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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10656 bytes
SHA-256: 81e62fde4f942618105abd77d0c6e66d1a37bbfa2bb65e11dd6ad114788c459e
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 17780 bytes
SHA-256: 939b9742e6808431fe322f49b1e6ff45755d8507973a8b79f211cd60e8f0cd5a
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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