Malicious PDF — malware analysis report

Static analysis result for SHA-256 1153f832eb1f4e11…

MALICIOUS

PDF

70.3 KB Created: 2021-08-23 17:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a263b806b7b98b6497edb9cd9e216e9c SHA-1: ddd31a9256e6fb9363b8ebe89ba37fa5051f25f8 SHA-256: 1153f832eb1f4e112a273bd11b6da5d39f24207762802b75db8d52885da89efd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

Heuristics 4

  • 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://chcial.ru/uplcv?utm_term=bartender+the+right+mix+2+unblocked PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9711a955c1fc9c76077153dc85841980/jopokuxelajuwizetewuxo.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/88610377309.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076aff614104---goxojijolezowagiweb.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/34613179085.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/37904158745.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/a8048837be62b747302c9a002e7adccc/35867541593.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3076f68e---80816220074.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16111a182f3337---69083657324.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/jopibafezoxurupavepuniwuv.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/20522794358.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/nepekuniwux.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e9cc0806a2a7e285949571471019e61/kunatetunetagafaz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9bbce0dd---76008008376.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/48294844794.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/dekagozuj.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ab1cbb78d---biwufejevuraziw.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12db56da4---87709899919.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9fb831501dede6130f16b07e294bbc1d/7769365984.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb16087ad1---suvixuloporosutat.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3b749e31---zomibutujesorosaxogoki.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/fojom.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210819_4BE918E8755CDCD8.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/03f20b7168410149ec3c549d607fc02a/nelitidewodidazipojofo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa33d9f2f---41883000394.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/37192224339.pdfIn PDF document text
    • 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_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 11256 bytes
SHA-256: a2f2ff0070086bfd37b4e5698cdce9d6dab3a418b85227d2df49fe4092586f18