Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d93574cfc812898…

MALICIOUS

PDF

92.7 KB Created: 2021-09-15 13:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 190dc185471cc4507e70be6680d9dcd1 SHA-1: ea8bb6a9452be421aabe5b5be81b250465bbe504 SHA-256: 1d93574cfc812898257e0a5ef376d6addf6872d35144fc708380f97f3d2c6110
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://playbabydoll.com/userfiles/file/golawiluxunekeki.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7ajmpqdh7me73fojj9t6nkpp7o/7432188821.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l436c32sboneba40p5oso246to/63627256654.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6e0b4181393a7baac98c29764e26bfc2/963271156.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/88244625062.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cih0ab14p9ftmgia7fbbcqvaus/fefugavajaranigekumitev.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d27d51ffcb81baaffb771be15cf28e34/10072498471.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/19211269883.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/76745463434.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/93905004404.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5479cc510c86ccb6e5139cdae52fa17e/49049989893.pdfIn PDF document text
    • http://www.corpeverest.com/ckfinder/userfiles/files/fuvulegadesekatubatuxik.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/99568990346.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/bbb4iv5hkmb9707h8qu3pqoubf/59100277149.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/74826738579.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/keketugurapunoxigupu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb6923c01---wugezirimoz.pdfIn PDF document text
    • https://breedlife.com/upload/files/49445582305.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/gewet.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/28110739585.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210913_C58FC9E33549789C.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/68052690769.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/fotogivotekipoxigaxa.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/43071917371.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/6044827193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+gun+full+movie+2020PDF 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_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10544 bytes
SHA-256: 0486981323d11f4a218c5f51c883686b0f52e204b7a5884f53fff6c1e80a4cca
font_01_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 17452 bytes
SHA-256: 0af93f8533ec187b4fd19b6b36979a234a06a8ebda0fe4f91e8c23dd354d4dbb
font_02_sfnt_off00014ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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