Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb91aab68acb6cd8…

MALICIOUS

PDF

88.6 KB Created: 2021-08-17 02:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a3a519ff20d4d5e34f0be9e8406b5d70 SHA-1: a9a0466e9eec814a63cadebcdbeadad48579ad7f SHA-256: eb91aab68acb6cd8f37ceaf936bcbdc2996c6d4dcccf0286940b110963dd487b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://consade.com/userfiles/file/64615450104.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/94474957203.pdfIn PDF document text
    • http://vladekoservis.ru/files/92077823006.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9cab85d192da7f2402baffc031ddfa32/niripanipejefadelowujon.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/76163234753.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f855b766---rodofosekixok.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/69101496369.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6480e6d8400837b1aad9182a8cd07489/nozaxufeboteru.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df07b35ea9---11519520153.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jebisetuzuzin.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4aa525d2b---72143756498.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/6834382533.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/83027391745.pdfIn PDF document text
    • https://fototipia.hu/files/files/zusur.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/pesadejebupoxitupuwez.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/11851725168.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3374752826.pdfIn PDF document text
    • https://tavio.ru/files/file/nawojetadexonezuxuvupop.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/31485700527.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4c12c85e1---rorujaje.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4d0223b0447f93e3c898bb5a9e801df7/degapivogapodejujesazuno.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803cdd37c0b---49849567177.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/70306532050.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869d6ff0f85---lezudujosariwotobifuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+potty+train+with+potty+watchPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 10316 bytes
SHA-256: 34b335bac8ffc11f0dfce1d0246fd0f509bfdc00acbfe0ae66de0a8928b3c458
font_01_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16768 bytes
SHA-256: 988320ba829382c292d785b6cfd8a304b528b4123eab7fdd233f4e33f084abb4
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16248 bytes
SHA-256: 1a6bc0a23ea9806cf59bb83a3ac32dce68040b93625cacd822529a05f6b61196
font_03_sfnt_off00013a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1