Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7da37b940875db9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 08:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a64c783f44e47ab9b61c61d793f0f79 SHA-1: 96143c0404658d142fc5000f536db7b10b847e37 SHA-256: d7da37b940875db914d795500b52b94f487ee188b79e29bdf25db637590ed653
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. This suggests the document is intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://appletechsolutions.com/userfiles/file/govagiweropoxetagavatix.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/15054123015.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/43335669602.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/49976405077.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b90285d4---18163332385.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6acb69ef---befolomoduvi.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/81622856861.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/68346105782.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/63348078361.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108241208357053.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a484a1daf22---77910252246.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/13934389078.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/nebijenolobavolutakeni.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/nefurovaradej.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rvi7r0rpnmfhsigthp0og5t0p0/lesijagikoribejagivi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117f1622fe---72763432336.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/noperopejon.pdfIn PDF document text
    • https://anjingliar.com/contents/files/79653660885.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090833d83c93---taviruwutibotamule.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/miraz.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160796fc85ab02---58565144646.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/if5fokmfp9n59hdv5a67mjkb0f/zelaxajavomuludenegizof.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/43365407884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+create+a+pdf+with+imagesPDF 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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 17596 bytes
SHA-256: d537acbb75414e1906605f8e2ff956dd86bceb466c80ceaad4c751c7985195dd
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 10996 bytes
SHA-256: db27020f947130b292291dfa124d179f166f65e58e0ef84ae8453302660a9358
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1