Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9746c35a06fc453…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 00:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa624852c07d94043c7d3094e09df94a SHA-1: cd2f4efc4d51082915460c7ad1fdd532412fb52d SHA-256: b9746c35a06fc4534ed10ee01b4c2a6f670e523427ff3c73655aafaedbe12aee
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV, and static analysis reveals embedded JavaScript. This script likely attempts to redirect the user to malicious external sites, as indicated by the numerous external URIs found within the document, many of which point to compromised CMS uploads or link farms. The PDF's structure and embedded content suggest it's designed to lure users into clicking malicious links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.2081

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.
  • 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
  • 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://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/somogekawupidamoti.pdf In PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/bodaneda.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161403d5344094---zofaxifavuralufexun.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gewuxaxaneda.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e5df240bb112d569a0de110f15e26139/93245723196.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/pukaragixuwopetiwisosijo.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/maluwavipap.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141748107820---sirebokevigaxuwamitomu.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zufoxifa.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/72628855906.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/18929228778.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/72055452844.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/zidakejivutimiju.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/dupirenuxotupisezosowix.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090719172095.pdfIn PDF document text
    • http://cycling-software.com/files/file/70203873879.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2f634588---gunedavomaminosunofam.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0324f25fc6f5f1b55cfb5fd673c22501/18165507548.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/58938270138.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/20786679480.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://dobermanncz.eu/files/97972793000.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd64e2bd6---zolejudimipoxa.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/fuvesosadawonebenev.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/vonomifebodafegusavofa.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904164853335219.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/rupivakotetuboxiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=modern+warship+mod+apk+unlimited+money+and+goldPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 11224 bytes
SHA-256: 13846ddae60463c539dea3e00f63870952f06a5d40a8b1f95f1899ad80be2739
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 21824 bytes
SHA-256: 35ff391f25db71ab19c7ef450be490520d245febfdacbefabff8ed4637d8231b