Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a6a30f967c0f41…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 13:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88b21209e1fc8e6db7dd9fd5f61a378f SHA-1: a584e1e5a004cb13ff0a3767f4f064b91bda1a3b SHA-256: c0a6a30f967c0f411f1709c20b8fc77f1cacfe4bcec387c539feb6e8cd109537
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and are structured as link farms. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to leverage these external links. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608752fea69ae---surasavafuge.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/73092065202.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdkn3bm9thdb5f582u3cnc94pp/78552148284.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/jugofew.pdfIn PDF document text
    • https://makenie.com/upload/files/76927560117.pdfIn PDF document text
    • https://ebooksweb.net/files/file/70496353080.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/fuwozak.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/71876623746.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6edf99158b---85881658888.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/7515665732.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/togemijigimoweridix.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf8517834---41262943126.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4be49d311651223b9c509f19dfca8a03/tutizuwinipinixo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161004d91eba00---7683722008.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/34bf66fa5c732c6118d44a6dfd1ca76f/nogatowubozubafo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/diwoxosefamufevi.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/27206672450.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/natobomegose.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d1e1351c39780d971db5f715daf7d343/nowadetetozolotaxi.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/gawelopexanivezuwimil.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kopubuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=remember+me+guitar+chords+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 17504 bytes
SHA-256: b25b046d96b3f8f3679a8ae4d333ab0cb71fff0cac5d4207dca6d9c8513ffccf
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 11200 bytes
SHA-256: 4f0dfe845591dd4fa191bdcbea364a4d104b220b889039c3ead6d0cefd67a4d6
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1