Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb7c1dc4658ebca…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 14:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90560678e14664aad98805edc51f3a9b SHA-1: 964e70a9b224d188aa91a4639b9026400e4fe8a8 SHA-256: 9cb7c1dc4658ebcaa1fd1e38cb0bda743f790ccf05f3ded52168f29fe879d613
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, which in turn host other malicious PDFs. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting. The primary attack pattern involves directing users to further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160864da58afd2---40254610905.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2745e7ac00bb9c440be041b14e9536f7/zuvufugupinefububisupu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/098058a3109ef613be476f9d08dd88b6/61481090935.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/44521885758.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tuxadebadegupozokomixa.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/wegokikatomuforefo.pdfIn PDF document text
    • http://klhl.com/userfiles/file/lijimadonuxofewanewap.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/pazuxirezigoxi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b91d5ab24---xujiromuliwewukore.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107312001004049.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/sazinonotoxonabapamuvu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3t4gjg7hkjnt2ud1qmeicvpvil/riget.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/553eabb135eb35cc2064d992ca2f2d65/54209907394.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7e56cc3b96220bdd83a22f7c6bcf730a/83155887139.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/84724685919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=there+is+a+god+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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 18852 bytes
SHA-256: 655b252cc2995bfc8eaf9c59837daf1887a56e14a424166945462f7c4527cef6
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10724 bytes
SHA-256: 4cd8da18b79342e590acf9c69cb98b30e2a5ca9405f1142d56b9ee62b7f548ca

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