Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba9333e40d2f217…

MALICIOUS

PDF

76.0 KB Created: 2021-06-13 23:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e8e56806ef78658dd0a76382c67ca8 SHA-1: cce0ec1cde01f6e9d1de0f3ee21777a8e6728df7 SHA-256: dba9333e40d2f217c09143f6141843fd30f46d1f8a93e97569a515f8a97d5bef
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://huntic.ru/uplcv?utm_term=ninjago+enter+the+digiverse
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9999ef6b---5348153830.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609458be54190---sevetetivajejudixixix.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4493a891c46bb9befae7545b5b3b0944/zaletezazuw.pdf
    • https://camgloberealtor.com/userfiles/file/80491874919.pdf
    • https://dadrarad.ro/userfiles/file/20083755711.pdf
    • http://haki.vn/uploads/files/sudafokuza.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c10fd5b98---jokeragajegetabuxulox.pdf
    • https://songuryazilim.com/calisma2/files/uploads/rijosesawutifokesama.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/b24lj4jvvj41g3im6i0gchnubr/39649709730.pdf
    • http://hrt-foto.hu/_user/file/55441620825.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/g2ljc4uv6pubbr9186guf2l20r/50052821773.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b03060ece---ladababevinejabirasuzek.pdf
    • http://kururlaub-ungarn.de/bilder/files/50360374011.pdf
    • http://4bx.pl/public/file/27164507557.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e2a1b5e610e436f16289cdcc48a32072/35767641959.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7fdbfbf7---talajixasuxid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf5.bin
fa380dff3126bc26dcbc86e1491b9d2a723d85d7fee76f0524326e582d2c3822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 5160 bytes
font_01_sfnt_off0000ff8f.bin
706a1bf42e4979e81fb4116347a8f6592bb4d828a01553be540317d12ba1f766		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 10236 bytes

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