Malicious PDF — malware analysis report

Static analysis result for SHA-256 2842ac7434f8cc6e…

MALICIOUS

PDF

132.6 KB Created: 2021-06-24 18:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3aa9d532a0f9197d5badd66520c32c72 SHA-1: 23fdee7691177ededce0f3f4f7602ad87a7c07c1 SHA-256: 2842ac7434f8cc6eae312f8744f0982b9789595b4b24140a409fa4e3cb28f656
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5018576723d83b7cb8b76a7cad190ea7/tulolabif.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dfcc77525b1daa77689afe1de7186c4/9138185673.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l3r306sndie4gvvrnvqg2orqph/bazidavodakazomezowo.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/19561694142.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8572b8025---37574710174.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050102463442.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc61fee228---9775004653.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/2665026271.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/52336211015.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/foberasanodogob.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d6eee8ff---kinezanedonikuluritisujew.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffda9d6489---renajupelovogojaraxik.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/15k9hmrcu24u366d16hf7vcvc1/nojogusazezawi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607953506db1a---95885871360.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/g38f9a7j7kmab9snfb6892h3ol/dagarovapudapapanosiri.pdfIn PDF document text
    • http://proxima-design.cz/files/file/22111074804.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=f059+powerflex+525PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEAE 1708 bytes
SHA-256: 4448b45c8e3203204f9afa599fdd8e9d7c59a6c2386dd453de3be2ffd13c028c
font_01_sfnt_off0001c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C713 5176 bytes
SHA-256: b194b3dbf4100c86c6068e3477f33d735cca5e3c09401d46ddcddb08c638f4da
font_02_sfnt_off0001d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8E8 12888 bytes
SHA-256: 0cf74456418c8328363cd56b274c59e76c2de4609ceb4ed2925ade8817cd9596

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