Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbf35fbfb391525…

MALICIOUS

PDF

60.9 KB Created: 2021-08-21 22:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd4e45f6942c7f5129c159e2779d6a95 SHA-1: fc02b0c2170077fa0a07287888f9c1fa9390dd94 SHA-256: 5cbf35fbfb391525712fd8db14498b752def33b3a3d89464cdb72e380e02441a
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised CMS uploads or disposable domains. The PDF's structure and the nature of the embedded links suggest it is designed to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9381

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://oklogistic.lv/upload/file/96728775880.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/rolonusir.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/vawoliso.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/vsnl4hl8gufqoku725r0ocd08t/90784777199.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/53305799391.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/wexuv.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/pifiwo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc1c97bca---lekufuwumupusodujil.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad2a897df---86053277808.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210624031756.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/gesijakoxofozipeleki.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/09fe335fe975024d9f3be82b84d05162/19233986720.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c9o95ja4nb7cfl8kvuv0q516m1/39429316468.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/bizujufumelofipovonepip.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c6578c6b366531181e8af19334aa3a4f/keverajuvije.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1900e3667b977eb104fa65a26a39886b/73615584632.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/banapowipef.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/74607396518.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24c691ea8---12113287887.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/gaxesitavelofabag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074260549ed5---fisafuwele.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pitomofopelamezad.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a371e262---88742276722.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/87030106637.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/13909822544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=conduction+convection+radiation+worksheet+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 11048 bytes
SHA-256: bae8d6af785123c5f444ac73c4f816c2c2e176cafa635007ac0e7f3a13c17428