Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab694f89f1e7955e…

MALICIOUS

PDF

71.3 KB Created: 2021-05-13 01:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d010578dc5e004924d283b239752cd44 SHA-1: 30a207c3c26ba7914dab3c069fc13001f3da8421 SHA-256: ab694f89f1e7955efcee5b619eec1a342f0fcc7e6cfb31007c91b797b1dbd563
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'lease agreement format in tamil nadu', indicating a lure. No scripts were extracted, but the PDF structure and link farm heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://mfdesign.hu/files/file/2391965930.pdf
    • http://www.celso.org/download/liwelokutufepakin.pdf
    • http://poltinik.ru/userfiles/file/50049723207.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607716679c1ac---12902676224.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/094f2a8cf5e26494497ce450def695db/vufujuzaxupufofo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608663c0debff---difegoworavik.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838545f0d2---gapabitikafumifogasuto.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718cffb300d---gedakafalufojuruvepajik.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074892b4ec99---61080573259.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804c75a29a---17953831919.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d24bc0666---81247798341.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rq3u4rhj1c3p7oa9hjtllb7f11/62708264290.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb85898fb---bumuvewokixukoxuli.pdf
    • http://stolizstekla.ru/userfiles/file/72077246043.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gmjfhpgjt8l7qidb7ttdpmisl/24984052932.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lease+agreement+format+in+tamil+nadu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db75.bin
626dcae9a597bed729ff326551690f7c24a792141e71600762b78ed0cc8f38a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 5168 bytes
font_01_sfnt_off0000ecf8.bin
ca812a703e86a99c5703261dbdede99a218f88f0514cd48721a326052342d36d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10404 bytes