Malicious PDF — malware analysis report

Static analysis result for SHA-256 2843a0ebc494b3b9…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 23:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33f8b1b284be6f9dfca0b7a25e59a954 SHA-1: 0c7f4b6bb15a33e982f1535f2735b9dabe83bfcf SHA-256: 2843a0ebc494b3b93a6c29811d03a2f4c7bb974ec5bf62ee9871f7c45afaec92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL analysis indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7fad9a03173ca697cff690fcd2074348/38086232337.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/c3c125aff8467d24ea26fde404f93cdc/29846761152.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/pnp1cmnavb2nj4quqihogpa0qg/27635986589.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/bdee234decc5745e1b7032078fa26040/89032634435.pdf
    • http://soldearenales.com/galeria/files/larosonudizis.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607053fd1446c---gopokunalolu.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d66259906---16875101116.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/voruwekelo.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20f153572---70764414811.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/672d0920c7a90d20347cf3c7ea0fcbb5/57001715735.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e12120eade717fac8d45ff00b8d2b98c/33405975362.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ngs7k0aogdr4kra8t91lsis1fd/lugimidovejepolin.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/98891392701.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70727942e---batixofejuxoripuvokovi.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e39c44df---gajasefisiku.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qi377tq960cs64u2l2gr94b1c/99060029902.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9129562a4d94f3436a05054c6df6c5d1/12134790949.pdf
    • http://villa-carlshorst.de/sites/default/files/file/ralevikuxoxodipasipurala.pdf
    • http://ottotech.center/userfiles/file/89785756841.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/affcefe24f1fe10672a96a95017076c4/83450077457.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6967a461---83570722300.pdf
    • http://banghaija.com/userfiles/file/wimejejo.pdf
    • http://lnianemarzenie.pl/userfiles/file/93801987889.pdf
    • https://alate.org/admin/fckeditor/editorfile/vobeworipapivabikibozajo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=previous+year+csir+net+chemical+science+question+paper
    • 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_off0000e3d4.bin
2f735d89b9a7302938f79bd605007b1534d044bce4e940c47423c48b3d8c9460
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 11068 bytes
font_01_sfnt_off0000fd7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 16792 bytes
font_02_sfnt_off00011590.bin
bbfadf501247d9b70213510bd051e19b51bd483e673461a57e767e80f88a2872
pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 17144 bytes