Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19100f955951faf…

MALICIOUS

PDF

55.4 KB Created: 2021-09-03 02:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11844675b03bfc200896602c9c74b2a5 SHA-1: 05050365759e0b1923aa9c39070d144e1d7ccc09 SHA-256: a19100f955951fafeffb95fcdd8e2777ae3e8a14d0da10452751b63e9a030a0f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm intended to redirect users to malicious content. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the nature of the URLs and the heuristic firings indicate a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8084

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://oniceh.ru/uplcv?utm_term=digital+transformation+playbook+pdf+download PDF link annotation
    • http://mya1fc.com/files/ckuploads/files/11824624706.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bf67961c---5907764023.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f56180d8---lapiburodinovunox.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860966a8293---texiwabo.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/73072879274.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/mitoxar.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a07e797ef---zomibefovonesagewik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b03a9904b---giduzel.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/buwesodawuvijode.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d1a81ff40056e63e618622bf0867cf4/subisovevoritowisebupozov.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/86671007047.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ab0b8b36---divebenitidolobixewil.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/85464037407.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/13904772385.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709533eb917---nubivogutuzonezobopu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791c39ee3be---63469565119.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2cf9003c---64671856369.pdfIn PDF document text
    • http://boxethai38.comupload/file/dukus.pdfIn PDF document text
    • http://contua.org/userfiles/file/dipodufegibaxex.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/6238501946.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/83467369089.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c9ecde1d5---fapakonam.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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 14996 bytes
SHA-256: 25c24b95db0f128a172a2413e079623dcd75edc64969c861b59faacd4a4db939

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