Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58055faa8ddfb55…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 09:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c47c17cad50f4549ef8ef74f18f4db5d SHA-1: 369894f70b5b12df63f4fa341538be118f9b1f05 SHA-256: e58055faa8ddfb55a10669924a4c39d3d7d618996aee909c70967a8d7b67a3b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple domains, including compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of numerous links on potentially disposable hosting suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7915dc757---bajefubutefidogamikujav.pdf In PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/4656430012.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdunu73m8e9ol3rfk6ck9ijbk1/16021926581.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/22259776229.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450d207f6ce---84932268527.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/53089365946.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/45883731550.pdfIn PDF document text
    • http://boldogelet.hu/media/21133803337.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/fukugebezo.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/lavusapiwajolatidamox.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/90690828116.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/dolizuvatik.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/sajik.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e8bb05bd8910a377508d6dfbef398a91/ranipejadobiw.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/wupemebiradut.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/wurusepukumasexolu.pdfIn PDF document text
    • https://ccvt.vinaonegroup.net/upload/files/8527190311.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/gajuwawofololiranu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/xomotarepulejanematew.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/koraxijuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+websites+to+download+free+pdf+booksPDF 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_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 10864 bytes
SHA-256: 2f93fb88c657588153d2b7963109cfa32024e1cc33df0bd1bd8487e80d6719cc
font_01_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16216 bytes
SHA-256: 99dd2030d4fad6523859891016bb1a7246679a515cf968a33b23347a7ab61afb
font_02_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1