Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac8da43a578cc69…

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 04:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90b6e4f6f53929252e570080c5614c6e SHA-1: b5366982b2b4ec6c0728079b7d6e1ab18b88ddac SHA-256: 7ac8da43a578cc69604e2082fa499fdb8c9ad83fb324161c4258017eec389caf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Embedded JavaScript streams are also present, which could be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • 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://greensquares.in/userfiles/file///85683233142.pdf In PDF document text
    • http://dija.lv/public/userfiles/file/gisutumofinive.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/joropawefex.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109100546239543.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/97139127943.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/ladikiniwom.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/56515504230.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/39588194541.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/guveva.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/28148429853.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/34951427425.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163190246557089783688.pdfIn PDF document text
    • https://mkart.it/uploads/file/63091557630.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/suvuvagibunimutalujimubi.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vunej.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fefa863b---51149645808.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/tolupakebidemo.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/72007164087.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gaitpl4jliglcp6pml4csk6k2/wazuwegerimajuxajedeliz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a7b7b00250906443a1bbf9e21fa9069c/rabitomonilegonipu.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/73489696995.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/4029003621.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/bbdc877eb2418148b1669fd94b560069/27473181183.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93829824512.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/67694579260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=articles+rules+in+english+grammar+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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 18576 bytes
SHA-256: 6f6c643cb84e3a1b2b4f2f1f60e5f6e42852e1d53107e084a504ead89abd3302
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 11028 bytes
SHA-256: 72f5160647c4a341362efacf07d39e4c036d4fe0045e5e737531f31a9eb36c84
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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