Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65f4ab5ef6ec6c5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 15:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e146ff1a5f2cbf5a6010611cd88cf5fa SHA-1: 79f94f086da59f796a42340e7e658a71bb27c983 SHA-256: d65f4ab5ef6ec6c57f0c8740c07df1183d622174ed3453917beedc71f94fbb7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.valathors.com/ckfinder/userfiles/files/lafazuromisofixomatorit.pdf In PDF document text
    • http://shinaval.ru/userfiles/file/51826491735.pdfIn PDF document text
    • http://allycatering.com/userfiles/lobevizaropekimud.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/53676798269.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37324923496.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/gexokatupemokivakosareni.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tovujabifuwagiwemotazile.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/72557860515.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/49509300602.pdfIn PDF document text
    • https://anup.bo/images/files/kazirewexevusixerevesaguf.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340cd183017---roladam.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091202101890881.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/dekapezeveja.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/tezumijinepawobe.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/92583521354.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/warigojapatulilim.pdfIn PDF document text
    • http://kbchina.de/upload/safov.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc05ed9d6e---xobamomiburuwinazupe.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/95626701516.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0e601i6qe655mbg4jl63kko210/33026522743.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/faloji.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t112mqsmfsano58boqsllp2o7d/jazasixutiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=magic+tiles+3+mod+apk+all+songs+unlockedPDF 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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 11112 bytes
SHA-256: b04112e832a7bbaa4131ec2698fa4addcc8b00aad528711b0e0ee3a948eb6bf6
font_01_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 17828 bytes
SHA-256: 2973dd302aa7a01eccc87d32d101f432e30f4e37af2002e9616d673b6f5a6b36
font_02_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1