Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad7ca0a181a36ad…

MALICIOUS

PDF

93.5 KB Created: 2021-08-04 06:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b9d35c9184265ac5da5d994eb3b3ee8 SHA-1: ef67a955465e450f5a16cf27be521bbf553f5697 SHA-256: 9ad7ca0a181a36ade22d2734aa37aa2731efb9f1920e8e0a0cb6deb169de258c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of external URIs and link farm heuristics indicates a likely spearphishing attachment used to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/41a8713543ebd4fb0b800f83b123afd4/zemezunesezotelofufazufap.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/41404944123.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6r35uaseb1iktgstt7hrabgu94/68842661928.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c91358fa7---vunovanekobikiwu.pdf
    • http://oaklandscreche.ie/userfiles/files/lakavisavogepekinuz.pdf
    • http://cuatudongbinhduong.net/uploads/files/vixegexipogesumozip.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3mpaag52aoat4va8582aojm4ee/15662139417.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609236638db08---11298505436.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f885d791---47791253158.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c168822e910---73490244387.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1415a7c071781b1b7f813ea3d4fd4875/luzawusazutiduralivabu.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/37okojei4bhc2p5tkjuqqst9i0/33633498617.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/40afdb3137d6069b29918b4f7a12dd87/11273193613.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106dfe2f3114---meredilexurigo.pdf
    • http://stacjaregeneracja.pl/userfiles/file/324299732.pdf
    • http://ptairsupply.com/userfiles/file/49615616490.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/94ndge7rvtr3dkbp3fc7u6k7o0/42378633982.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/992de66333052af69accd115052e314f/gazifovirerujoguvolakib.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/86151212201.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/15374768666.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ced95c8e---katozifujozonadaw.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pk496erk1j9l5c6b23hs0r7ork/63184275522.pdf
    • https://e-room.co/userfiles/file/rabuwufaxotagapujugovevo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jungheinrich+eje+120+error+code+list
    • 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_off00010769.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 16792 bytes
font_01_sfnt_off00011f7b.bin
4db3b09b0211ee74e8a8e1fd4a5a568a18f69fc05c9432473d5c6ddd7a4c93da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 17676 bytes
font_02_sfnt_off00014d8e.bin
ecd1ef79eba61d2f4ac1b6370fa9e24b07d8a8c112c75280f691bac9dff4996c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 11004 bytes