Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3da2ef42f46adb0…

MALICIOUS

PDF

71.5 KB Created: 2021-06-01 10:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fae04b330e3ae1f50f0e34e1a5ad4e6 SHA-1: 8ca71b7504566b6a2573c14a77f528eec9efa568 SHA-256: d3da2ef42f46adb0fa77b86713b3446f3ad1d09c0a9ff1dc9d1e2c6fe1ceeec8
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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 https://tenshinorchids.com/FCKeditor_upload/file/bavofarurukonaruz.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6f892ddae0c8024882eedbb9f9165a16/91758561283.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b026b12ad---81314824928.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e038c212c73933a01346a38a9bf87a35/fovikidiwelixet.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105032121158714.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/97857147370ec45eb7aecce25e1bfe78/lomebexusitoniveju.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/019c9dcf89d79a9f2cf39e031aca4988/nikoxetedugiwajasi.pdf
    • http://biosite.ru/images/news/file/19312306588.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/02dc580651025e06694f136ac3fc2780/medolur.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc77ed06761bb45c3864c31093b1c71f/kapakuvowelelulal.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f4c82614---napozurilesofipofo.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/485bae756068b13ed41ed75d73211310/zutun.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2a03930e---48796127063.pdf
    • http://stalmost.pl/userfiles/file/vogopazoxudafazisujofi.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9dcebfe4fbccec8372eecf89c1982f47/4059682735.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52a9a30d2ae696060c350af579de48cb/27247382852.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070788e3d346---13220887362.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/49303387560b59c4ccb7da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+write+an+internship+confirmation+letter
    • 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_off0000db67.bin
3b0b7b33affb08e26d9c890658cbe73d3b0bdbc12bf20fcbef965843b56a856b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 5448 bytes
font_01_sfnt_off0000edd4.bin
8cfb17cf42c3e549a614a6a3c87bb671e28601437245d8ce7f4d768b30334f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 10268 bytes

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