Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b84969309054e14…

MALICIOUS

PDF

187.4 KB Created: 2021-08-02 12:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc2b7845970ba05e92074b4d2440ef9d SHA-1: a565b0f7f435aeeb7dcc07d336130023736926f1 SHA-256: 7b84969309054e1455ae07e93b20a0e2214da4fac08fbec387b02c4c93a12bde
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs. Many of these URLs point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple 'link farm' heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160755b74971b5---kolusaputijuwoxeziliweja.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/197d9934a5090e5e92145ceaee613f2f/fujemegaxegezuxowidelapil.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/54n4h10mdb69i0nie94uhitv6u/75879005439.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/50137880d8f20e073164e0ade6531581/8406774537.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bivefi.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/85620614864.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/guzomumebojudo.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/fadurijuzo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a1925a79eaa5b6f83c5e6343d970bed2/61548753028.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210730230409.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8cd5ad211---36400075339.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/87947558918.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/868f0ec1c2e11a80437305a13765d1ab/veveretasejuwapifasufugu.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/30522741460.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/81066743188.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/fafesukut.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2676bc7dd383e778d6267138dd9654ea/suwepabavadete.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/11391629053.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec515547922---likewuj.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/22870966376.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16101348c77138---67081413425.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210629_D1AC540096351387.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/99948238540.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f43bef9d---newefuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=need+for+speed+world+2010+offline+server+free+downloadPDF 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://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_off00027b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B71 18676 bytes
SHA-256: eea5e7ce67f7cb00eabfb401a8eb531117a0db805f1c89086c185b0238f21208
font_01_sfnt_off0002ad78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C58F 10816 bytes
SHA-256: b8c9cf279e5c72ce58ec46606395cbdc9f61ec490a0bef021af5142bfacf1afe