Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbb0a33aeee532d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 04:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b5716947978ac9b85fddc0fe9aa21a4 SHA-1: e1953a6edecd203e39a5bfe09c0885a63cf25bab SHA-256: 4fbb0a33aeee532d3847bf8b480769917677007d8f3dce5df937f411b6b05841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The sample contains a link farm hosted on compromised CMS upload storage, directing users to potentially malicious PDF files. The presence of external URIs and link farms suggests an attempt to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb335cead---51392624192.pdf In PDF document text
    • http://101eyewear.com/luutru/files/xulafavarozebo.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/87620205013.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/miwilolunosubora.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784b9139a2b---51767892074.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/xezuwitisuzinejadujapuwes.pdfIn PDF document text
    • http://cymagun.com/userfiles/fozidamobokixivefo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lovodebovesuzojasajixiz.pdfIn PDF document text
    • https://premium-house.uz/images/file/dolisudiramu.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/se8s44pngdt5jddvjenitkp4t6/nuvupijapadidonegabu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef380b5831---92306425038.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-03/images/files/nuzazupidodipujowodadenub.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609944c58cf7c---73113204430.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a002ea50a5---36915355647.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/56220988878.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/46772307139.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/giramolidemunorexowetop.pdfIn PDF document text
    • http://polkovnik.su/upload/file/95178457107.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaa8d81da9---vitapeduwofavulare.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/5806235724.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/20267629926.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9i56fuuejq1og8duhfav19veb/xaremexomip.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091e3d5e51ad---rulamidovadi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/72688250757.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/59586886370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=texas+driving+test+book+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_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10988 bytes
SHA-256: 3047f233be3e9e1110ddef16f53afe83938223dadbd633d6c0d210eaa3f35e5e
font_02_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 17420 bytes
SHA-256: 40d23ed91ae8869796d4d9c5cffb9d1e956dae8d0d88c000e95bea200a3257d2

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