Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9948269254e54f…

MALICIOUS

PDF

75.5 KB Created: 2021-08-29 23:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf0b44a2136f9884676f684e988731b9 SHA-1: d4fb8f4d5079f00f7ee9dfc61608739d5cc55807 SHA-256: 4e9948269254e54f0ba7c5f34231b32a6d5aeebf8be3fe127ab0c0627b121f54
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and other potentially untrustworthy hosting. The ML classifier strongly indicates malicious intent, and the link farm structure suggests the document is designed to redirect users to malicious sites or for SEO spam. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161102f89b4c7a---moxijagetudunarotiterilo.pdf In PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/76319501357.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107d56e049a9---85576098136.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4e5196da3a4e2a6050d4397ba6cb82e3/gevotegubeza.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/vogogotofeso.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/32701830711.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/wofezasazuvopusepulume.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5762badbe1---jonodajojebup.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/63377465550.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72489863646.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/23741970520.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7aa61171d4b8e8d4757f807c40509bd9/refupedumowivifubi.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pegagidodorul.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35cdb8028---rezajilojifitapobetu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqod01bv9oko3u5rukabnd9oha/26422045284.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/j7a357ai5test6uf7prca0pr8v/60960022173.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096b12c1fe---fajarisibefu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fdebde07---fiwoludexen.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612b58e5b74e2---xixukagigobe.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20442ad96---2097594839.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/77162482894.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dr2ck2r1tpoheohsk0jk8m25dh/nakusuto.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72fa90355---tidonixazupuvow.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/55283823533.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1015a265---dejifape.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3pd3n9o81qr2ok76r2h0go8r1e/60314863925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=late+night+asian+restaurant+near+mePDF 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_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 16492 bytes
SHA-256: 777b1688b1f9ee8ae1416cc129d1ce5506df470bbbeeb8770a937e04a8d059ae
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10448 bytes
SHA-256: 5fbd1a59065f36e78fd7d3adf7fb974eff908457b3fba22e8302f9cc9fc4a6e1
font_02_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1