Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8d68c836a9ccbc…

MALICIOUS

PDF

58.3 KB Created: 2021-06-20 06:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 40bc8fd9b847cda12be48d472a84934f SHA-1: 6048bc98fbfb70d466179841d0f1869b40b8a01c SHA-256: fb8d68c836a9ccbc63d685b19700a6293fcfe845ea2e7c9c44db1979db8db34a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely for phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=full+house+123movies PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9eac783e---25329826401.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c7486f3d5b8.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083010c12241---sigizunupoxosawew.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xedusogala.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24976df3f---sidunuwebozadutojena.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gerakejivipen.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hagil8r28ht4icis1arsh24lqr/tigufixexojop.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf459a15e7---nivizoxusidu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dakugetubi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a932d9b9c---kozoborefilotufuvegeji.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160857e77a15f3---mexugozawuv.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/63280628664.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zexesafuxitiwifulu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a424a45b6c0---bodideraxadapivomude.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160754475c2e5f---xotebuvexawopabemudaxiwu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e814c63fd---80979108030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD19 4984 bytes
SHA-256: 06229b6f91c21f0bd70b07e227e4ba89b6b41e97b8200a380f20f2fd2c58a4f6
font_01_sfnt_off0000bdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF4 8992 bytes
SHA-256: 03b82777d8f57b78db76d4b2df05159fc9fb31240ce7758310dc88067dc7a54c