Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9917aa7a12b6649…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 23:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b48bf8f537d36eb949276a04eb4f1e2 SHA-1: f818386b66434c56347eddda2bb16334ebc4667e SHA-256: c9917aa7a12b6649304bac5ca0dbbcc8b466ddfd1b864ec517e205a9089452a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised infrastructure. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=how+to+change+text+font+on+android PDF link annotation
    • http://otvorene-srdce.sk/userfiles/file/35315645264.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/86946230536.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/83724817324.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a384b33fa4---34367790036.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/seresuvenojidinik.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/laxuvafalofetek.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/53158812784.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/jabujek.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/zodevulakudizemarapexupu.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/tasuritowo.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/35044917681.pdfIn PDF document text
    • https://matricula.arendic.cl/files/17774532891.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/16264840231.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/15990733109.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/jezobuzagodutabakatamak.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/julirawalutojuze.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/92890735603.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb0bd1184---63533258193.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161361620b969c---lenabuvo.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/zisuxoxega.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/tanetawisobed.pdfIn PDF document text
    • https://fototipia.hu/files/files/24543836407.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/ziretob.pdfIn PDF document text
    • 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 17924 bytes
SHA-256: 93dec983e6377e456be375d3e8384fa994c3c044590a170be411041b063eb662
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 10720 bytes
SHA-256: db46532887af53ab5ccf7959d44726e66a864b9e6bf2226d786ec240bc1fbb1a
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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