Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b1ac6639c0778a…

MALICIOUS

PDF

83.9 KB Created: 2021-06-17 22:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c19e2e7f993e9739aab51873e1d44539 SHA-1: ad0696b387b394e952b59fc1808d07980ecd6d57 SHA-256: f9b1ac6639c0778a192a03519f498c316316d8f0756498f7e26e505df67b8387
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious function appears to be the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xn--dlek-5qa.com/admin/UserFiles/file/korosuzatudejolabifokuk.pdf In PDF document text
    • http://andlupa.com/userfiles/file/xufojosine.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fumukebepu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/jigijumiwuroxexujina.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wilimirasa.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f668cd2fcddee8b5305768de48e21d91/78138140552.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc60fef3657---peropide.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f26c5f22---besiwebapozezig.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/eb45522171d8656e595a539fcbfdc31c/wuzurujapijidu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9ec8deea04d6f4f63341f149f8858bf4/tetonuzib.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cd66c37027e8de8c6f7c16a207864f10/juweti.pdfIn PDF document text
    • https://activepymes.com/pub/file/73348666762.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/detotitipufobowanifeve.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/palavuvigituzop.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/bezaxodimi.pdfIn 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/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+keeping+up+with+the+kardashians+season+10+episode+10PDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 5668 bytes
SHA-256: 49494d6a7ff796e4729fd2cf6987321be2b31f97a9ca7a40fbd4b9c67f7363f5
font_01_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 11492 bytes
SHA-256: 8a0c58ac511c21a3dfc9b6a92cd441bdae29606a4d5434490eea4c361f129f33

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