Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad35bdcfee9c23fd…

MALICIOUS

PDF

78.5 KB Created: 2021-07-03 00:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32f73426e53bdf99d1d1f93caf482cf7 SHA-1: 537cb56f3f29602456084eadf5616f9f62eeef5a SHA-256: ad35bdcfee9c23fd22ed120a92f6a689d9a7fde827a1c5d1917af3b00cd90946
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure and high ML confidence further support a malicious intent. ClamAV detection confirms this file is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb82fc6abb2---8219145725.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0170b5e857---73136048488.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a94880dc5dc---lutukewasan.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d808623e3a---41975439815.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430d4e72cc---wubopapivuruwak.pdf
    • http://stauarchitetti.eu/userfiles/files/xepegimuseguluresofoname.pdf
    • http://diysmart.net/userfiles/file/38613465394.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/funodeniguwikugorafos.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093237da131c---toviki.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e53ea2a88---zugimewetoligivebezej.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/18ebfc78aa457f1a2695fea2f1de1904/40008607456.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb64f3ed45---tifesubavadukefilifipi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f74027722efa874704cbb8bc4ee4c31/32744746227.pdf
    • http://hitecds.com/userfiles/file/65345224633.pdf
    • http://aaaexpressheating.com/userfiles/file/fuxari.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/472d2a18382c23691ee08415bb29b33d/fopuv.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/52d2dd70b560ece71282547202f73a4d/17115416764.pdf
    • http://stolizstekla.ru/userfiles/file/katonaxokekivozu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d0e3cbfc---wozadu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=i+want+to+slow+dance
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16792 bytes
font_01_sfnt_off0000e229.bin
58b6fb49b18cf01a34632fb6dd6c2f57bcb5c447264a690d47bfc7c5eff86dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 20656 bytes
font_02_sfnt_off0001146b.bin
5e6f1b725262aa239ebd37ea5f51a025275861b9de3a371b74e5962cf64b1ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 10208 bytes