Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4052cb55e4239d7…

MALICIOUS

PDF

82.8 KB Created: 2021-08-21 19:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f65f7ea407a6638b3c59add1ab980440 SHA-1: 70d97c06d6693b4cac2931babc3d850c552bfa8f SHA-256: d4052cb55e4239d7cce0b46a5162ceb2b1f62f78654405884250bb39079266a3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3f4827947---19035483311.pdf In PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/dinepobebetixigaresubufu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/99156295622.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/kokibodugotanepojos.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xoseperemugozumigokewade.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/39122323646.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/tisovimaremubew.pdfIn PDF document text
    • http://zerosquareonline.com/file/pudizesijanatisibiwowo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/wigikita.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c800a9f95f---92030150108.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/turirilezolalumu.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/peviwa.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4580de6d6895a0fab2c52289d0d04c48/49631981782.pdfIn PDF document text
    • http://deauville.ru/files/file/73549142501.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/vitamurebetojav.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bimemukalenapobiw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/upc2adsrge31pftgr203h9i7tm/gujofesakalorawuwazebovul.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/fipapeneferasikamixareju.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/7806793126.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/tuzugigeboluz.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/4747432175.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/12203475283.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8v27141l88pbegfvm3nf5njj9l/37573975212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=3d+trees+cad+blocks+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2F 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_02_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 10768 bytes
SHA-256: 41507afce11820d56ceaa832abe0faa328c8a4cb59280c25e37e6c1b9ab65622
font_04_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 18076 bytes
SHA-256: c0703e806abefeb5de39c856d65a556407f010c641bfc94a6fdc34c3b10acb91

Open this report in the interactive analyzer, or submit your own file for analysis.