Malicious PDF — malware analysis report

Static analysis result for SHA-256 e053f05dbf580734…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 21:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae019abec20786fc4e5883bc38a100e6 SHA-1: ffb2c2506e8b801911d98bc2b613d0159a47848a SHA-256: e053f05dbf580734cf5cbaea2151e0974666e9ab4baa4893827ce42853302328
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to lure users to potentially malicious content. No scripts were extracted, but the overall pattern is indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=how+do+you+transfer+photos+from+computer+to+android+phone PDF link annotation
    • http://nazycakes.com/userfiles/file/79183723903.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/90817102415.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/labegovutigewerisuz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2af3e9a7479a6b482bde445dfd40e64d/76288391470.pdfIn PDF document text
    • http://rem-proekt.com/f/file/89782192783.pdfIn PDF document text
    • https://tmtteks.com/files/81319652319.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15661144168.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/xuwedegakomafedatizunama.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8gcuqq54g0pdmfq0j7l9c5s2pa/kajitulotowuxiwovubaz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f176b10076---22894240053.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/nusamibenisewawedatukod.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/tulewid.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/mageligumisudonirunodafat.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/57546003428.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/sigofogitadiva.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/89509341749.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/34330062612.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/57053991674.pdfIn PDF document text
    • http://marine-inox.com/i/File/30664366983.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gixitaxed.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/rigupazivubabigefunabe.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fexinaxosodokukit.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a8063b71df363bf6b3e1780db388fdf8/kolasedefotiroziweluk.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/mosowepukafijuvisujajono.pdfIn PDF document text
    • 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_off0000cc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 11132 bytes
SHA-256: 9b2250908386c741f3cbca45bb9f5f2c2e043a6a4aa8fec9a77a77923208c72a
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 17416 bytes
SHA-256: d78c183357fe22f5b5bc5ff80af5b9a15eb2f958477fbf3a32e493d4d894760d