Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7656881ea6e42e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 02:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8e5c591d4079990c16ef3ae6c715001 SHA-1: 0eb25599ce384ad9789795ff0bac1e3c5138d5d5 SHA-256: 9a7656881ea6e42e5933f9faf71f78defcd7a526315ae852c9e4d46f16a030bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities or contains malicious content. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hattshopping.com/admin/assets/images/ckfiles/milekub.pdf In PDF document text
    • https://kaimano.it/file/53813800293.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435a2330699---genipokakegatugarizekuve.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/40047938130.pdfIn PDF document text
    • http://runhouchem.com/upload/files/16798704107.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/64396123902.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910181926.pdfIn PDF document text
    • http://mp-journal.com/media/file/5253654525.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabe270ad---94863230867.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/jozalaxasarilaxuloriromab.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48649652346.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/tepado.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/54185678911.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kidifesejoxebekoxejulelo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/3287553383.pdfIn PDF document text
    • https://reha.bg/content/upload/file/63363436630.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/78835267640.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f8c47e02e---67749643222.pdfIn PDF document text
    • http://www.polni.si/Images/files/xinokiwulazepibagoxazozig.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c064080e16---97468190304.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/fanadesat.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nemibasogazijowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clockwork+princess+free+pdfPDF link annotation
    • http://abcs.umontreal.ca/upload/files/40474345061.pdfIn 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://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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 17636 bytes
SHA-256: c6b3e80a46f9a7b1580248fbccf5ca0c3355b0c0ae5abef926bafef431848476
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 10564 bytes
SHA-256: 90b42ddb136ba5988dbf3c9ee4160c42d4ff5dd72305f5dbb76f25976e57b57b
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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