Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8868bf9d73892a…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 02:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d95a6593ec2ee5fa8335b7ed77197ca9 SHA-1: 3538c73cdefaa3ac21bca205a658b9c0f565b8f0 SHA-256: 2b8868bf9d73892ac1231b40116b42755629f14bc95d9e04e5c036a2fbdee668
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://artasedanasingaraja.com/uploadfck/file/bulevatuvoreziwonaluruji.pdf In PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/89546681165.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/056a7263e84fcb25095c6650ada06741/delal.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b7166cd9---6063206819.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098152086e03---safexev.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/99752376315.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f9ae217cdb81a39a8936b0f0fe4b7c5f/lunisizufo.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c5409dbf---98941405591.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/lowejirufoxovoxore.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/k1mpdhieaia7ludfrpia75ehpb/29914732249.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a5fe877de8c1f64c338b9273f0cb3d29/sezegedojekekusixorojeko.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/figovutidowijekun.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb933b854f---ranijosebaxoxogateletowo.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb0336b74---79842765061.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sqmkramq61pp1jpk1bc3tf8tfj/91564023165.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/nifuwudigipegodegiroxeg.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f6add58704c1afb088e137d0494288c1/82416726299.pdfIn PDF document text
    • https://baongochoa.com/upload/file/lidas.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8a203e21---wesumegekopadojoke.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804e7dc0bd6---65440306529.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/33b665b56a9bce86f9ebb3fb5759add1/jazinososozavifet.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wogotiralukidugesafu.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kewilononedewel.pdfIn PDF document text
    • http://ccl-ciecie.pl/userfiles/file/pedekokudezevitisiveje.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/vejekelifiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ver+la+ultima+cancion+pelicula+completa+en+espa%C3%B1ol+latino+hdPDF 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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 11052 bytes
SHA-256: 29e18d7f8db424e5eac82ff90ce148b2a02abd29866d838f71bb9c34b1657158
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 17264 bytes
SHA-256: f8d8e7aeda1a6d402b511f57e1d91d42c4cbac6711d03c145a88a509cc709d08