Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fa73f36d405463…

MALICIOUS

PDF

86.8 KB Created: 2021-07-06 13:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f05f8656b47126093b713b70e8f4cbc3 SHA-1: 659902eb3fc4df3ad302cb54839e57be096f2f72 SHA-256: d4fa73f36d40546319b8bcd69527e83419dcb05b647300101936920d9a9dbefc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These sites likely serve as distribution points for further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/9vos5184epmuvploidmoldniqm/16943439006.pdf In PDF document text
    • https://rajaunited.com/contents//files/dozobefafefonut.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d445b88f---22859370504.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/26992295892.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/7628058028.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc5581b448c---nupozopipegifukexud.pdfIn PDF document text
    • http://vhktn.at/images/content/files/98540488418.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/77600250374.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/33911969113.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51a0d4da3---bowisirawidudok.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/82158882384.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dixuziwiguleb.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qoh15b7tnkda22rb098htvumq2/48135775675.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/eddfk5vjd4mmup27jjm4l7eg37/jajazoweb.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2abe836ba3f9e5899753e9ce179a251f/tofef.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079903041b63---luduveb.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/nofijaxanatawaralatexi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6415e07540e6d73705e6413a3faebd39/jimumuvizofinujeteba.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/jufutusebukofifegamij.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/aaec200d8e7272261ed242300be91e0b/losotes.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bajobasuvopewezurujefobi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bnnlo9uvgjbemonljlpo69u4q0/97572168028.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079478a3d21b---49280766432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=where+should+your+puppy+sleep+the+first+nightPDF 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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16684 bytes
SHA-256: 6cd02af3c6b648315078c71fb84e57764eaebb2150a1ba96cbb6f657b6bc15ee
font_01_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 10824 bytes
SHA-256: ce47ae463ce751706c7106731b5c8d8f52f627ef5608719828c0b764338bc4e6
font_02_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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