Malicious PDF — malware analysis report

Static analysis result for SHA-256 f645c189eecb3ed4…

MALICIOUS

PDF

76.2 KB Created: 2021-08-21 18:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f5de64142c154668c0e69b755037f95 SHA-1: 76f16a4eb4db95eef37988aed760e66d26a05ed8 SHA-256: f645c189eecb3ed468a524dd2edea7f357d868dc6eb0f1a758400479410d8935
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs, some of which point to compromised WordPress upload storage. The document's structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6796

Heuristics 5

  • 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
  • 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 http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/70600127516.pdf In PDF document text
    • https://anthonygillant.com/userfiles/file/18800582851.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/34643147115.pdfIn PDF document text
    • http://nanopena.cz/upload/file/xorilekubatemitigidupuv.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/vozagometegifovugixavan.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff71c720b2---bowekevulopeserumuzesa.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a6176152ba8370af0124a6824165c710/kopiperunilenid.pdfIn PDF document text
    • https://codecs.ro/images/file/supunuporuregajoso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c698da54806---bineditibitolamedeve.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/44068120030.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072429927a7e---neximofujekesesa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/92810e1d1a61a89fb32b0e330aabf898/31757299687.pdfIn PDF document text
    • https://digireg.at/upload/gexaxamoxerabobutufela.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/bonupeluvisam.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/58940085891.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/ritiperepagosugasuti.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/vekinebaxunuwazixalejin.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070389e32524---simevobojujufutowigu.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/17147617486.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb317cd67e9---mejokatumome.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/xuredebazeni.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/7250044160.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/danavimibub.pdfIn PDF document text
    • http://carbonelite.ru/file/rujogoselozutopigadamas.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/q6cqg726heh8ppohm8rlsq1uu5/93993739806.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/norufonibavimekatap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dibujos+para+unir+puntos+para+imprimirPDF 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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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