Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873daae340e0f46…

MALICIOUS

PDF

85.9 KB Created: 2021-07-30 02:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 754b6327d405b021a4dd28185076ad5f SHA-1: 331d9fa694e6fe13f6d8aac514e0be46d8b6fc89 SHA-256: b873daae340e0f4689995fddc71c39bd0ffd67dd9a6e10eba0bfabf80308834e
124 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. The presence of numerous links, some with 'utm_term' parameters, indicates an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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
  • 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://totounited.com/contents//files/kopub.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5a984ec17937096d42520f6053bcbd81/wizivunujepabaf.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b16bed35722---58869048629.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/dujizirebavowe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b09b1e8e---nurakisedemujorupera.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fe153bb67---jukabizetotajemadusipajod.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/51903183666.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc9a171b0fbb6ac400447feea585abbe/44302362521.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/a5hulo22lbh3bbli0n20m103kr/puxamifobavefakefenovixot.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160765dfd23d4d---bujujutun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b890021c0---61908115671.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdfce405f3a9aa0dea62c9ae9de7001c/ronolijalubatokosabitowek.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/genaselopivagebatoronaz.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/durilolapojadefomosonaw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a0b3b403---xuselurukijopol.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6440bf51---wijojiwizaruzumox.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f4d5e0764eb8f3757b91b710aa5f0adf/bisudimot.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mi50f7ithin2hi6c8ogivgl17/24490391229.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ks4qoodu28m5hr8ml20p4nqlg6/daxaregemizibifaraviku.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbbfe1213e---fekawuxopaxevuxobuwifagun.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/folupimopuponepanuwik.pdfIn PDF document text
    • http://df-foundry.net/d/files/bisojubes.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/13990013750.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f5a63185---81318602786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vampire+the+masquerade+v5+core+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11384 bytes
SHA-256: 70690155d5854b64369dd1c77fff6e5c9018480ebeff36ab171b0b1ecd69af4b
font_01_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 18744 bytes
SHA-256: 3aaa8e7ef71213e8d8bec2dfa5549440ab4daa6e593b1b841b6a12e2a0740977