Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bb80875f048add…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 12:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6431e0b0f9c155dff64269420e5eb39c SHA-1: da4d324fb243c580302313682c5e3a59338d53c2 SHA-256: 20bb80875f048add12c90c24ceaf82896ad964073c56fa04a26c4a3dd0913aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f7ac45e05bb78136ab9f297e0f786203/25420925121.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/599a46e90b5d8ef5b10950ee20465429/60429522590.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/lojexunelafafoduwake.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ebca50ab---sutikuxifovija.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18f5ba258---nidoforibewozi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/fejodo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078610c5ee7b---74093291715.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e0e6dc8f---pijufipejimono.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ckgenq8mip03uoif8gomam7be0/nuroxifukijetetegi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee714d5a2---sopezogowiwosudabapip.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/maviwesuxur.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/fagelifiw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vuk23bppo96kro2ln5309iphh1/ziwulekaxudow.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/bevugan.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zewerazizupukuzemulujixu.pdfIn PDF document text
    • http://yilip.net/userData/board/file/benaxawewumajakivumupat.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/tuberosuwuxixetijizuzi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b87369fc9---madavobanexur.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/zaliviwebufokiluni.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/wimam.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gogilofopigoredoterus.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/22129443500.pdfIn PDF document text
    • http://dgjst.com/upfile/file/96680525760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kamus+sinonim+dan+antonim+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_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 10472 bytes
SHA-256: 8628225a169f9ff0d0a903672bf7a290fda652626f68f196ed74a6ad9c93ddfc
font_01_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 17672 bytes
SHA-256: ee0cfd3ef40ef967cbb24cfa13a593975d6fe9e23c786ad5506bf4987bb07ab4
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1