Malicious PDF — malware analysis report

Static analysis result for SHA-256 95edd0abc993fadf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9a3e8c17c602af4e545a5e3bd05afe4 SHA-1: 5e0adffc29513170517140da67e7ebbfa7778690 SHA-256: 95edd0abc993fadff54ce6e7a25ffd1ad2ad8efa3b52b183c3fa7621389aa20e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting it's used to distribute further payloads or conduct phishing. The PDF structure itself does not contain executable content, but rather serves as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://club-integra.ru/userfiles/file/kefogulomugas.pdf In PDF document text
    • http://topaslt.com/userfiles/file/fanovobexewewukumig.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/31871884033.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630760294.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e66720932---dariri.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/88635732399.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/gedoxubuxaduwem.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/76433622796.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lodikuweronirexufojuxofep.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/69110165966.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zuzobifexag.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/83002423983.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pf2518bcl2onklep07mlrc9tme/raragosus.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fa4d2472---bareranososibe.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/acpjk8ceveri6tqme36lo20b8k/renamefafufidizigo.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/lapafofebiwexapojizipofi.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/saradopura.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/92265186087.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d969798e93ba520bee71ba8e0ad6a580/10785633826.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901165347092961z68ulgyrzd1i.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/xiwara.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dogafemoxuler.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202192213241.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/79398541291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=react+native+create+android+folderPDF 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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 18972 bytes
SHA-256: e6b6a3a5e1bcd18a363546f3da8b2e2d810ed884ce0d65ae138b7564c3ac2731
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10412 bytes
SHA-256: 1002209d5cf32e2b5dc362d52c28ad05ebf5dc5d2953ec60e193a327146adc4f
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1