Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71b10a9f240e63b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 08:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c384f610e354ef8f35a67b94d2f2de0 SHA-1: fd463a2f47cacc53a60e07ee7dee82a1fdf484a4 SHA-256: c71b10a9f240e63b3fca1c2a5a0cddcb0407e7cfe185cc817a88e68ad47f4521
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites and disposable hosting domains, indicative of a link farm. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ipost.mn/ckfinder/userfiles/files/turibawisefata.pdf
    • http://corporatiegids.nl/uploads/files/garulevobel.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wuwaxijum.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/pofiwikifovipuwopab.pdf
    • http://soluzionebenessere.eu/userfiles/files/kodomozu.pdf
    • http://stjconsulting.it/userfiles/files/19007146998.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ad6f4d5---xasikotox.pdf
    • http://tsutae-f.com/js/upload/files/11769887259.pdf
    • http://dotykbylinky.sk/_subory/subory/mofalosabup.pdf
    • http://ttccid.com/userfiles/file/757900072.pdf
    • http://nmways.com/uploads/fckupload/file/befuvafeminipo.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b67374a9e---64438913549.pdf
    • https://parvazyab.com/basefile/api203/files/kezebapinaxav.pdf
    • https://at2-turbo-j3t.com/contents/files/mejipik.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/juzanunuvegaw.pdf
    • http://musorcentrum.hu/files/article/file/daguwufowimujidolixa.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141975a435f6---465390963.pdf
    • https://mihalex.by/files/files/74867490682.pdf
    • http://dieterheich.de/images/uploads/file/wosumujabejalekuwox.pdf
    • http://back2wood.de/userfiles/file/pibajoxesezobumupe.pdf
    • http://4bx.pl/public/file/susineris.pdf
    • https://kermoulin.com/userfiles/file/42053575032.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1f6fe5b02fc5e8836e2df21b29f5514f/xevoxodopiliguj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=poco+f2+pro+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5f.bin
284dac021473f07163fd31f15370277494080c8c15be21dbe64f48a55ea23123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 18580 bytes
font_01_sfnt_off0000fb98.bin
3537b8c99360aa3ac637808af3200f3f41c9bd2b9828716acf422c5646d3dd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 9960 bytes
font_02_sfnt_off000111a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.