Malicious PDF — malware analysis report

Static analysis result for SHA-256 763775f91aba7c85…

MALICIOUS

PDF

106.2 KB Created: 2021-08-07 06:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 20674c1d8866a62f80feb2bd48b78715 SHA-1: 0f10697d2a4e8636e4f0906dcb444015db2d3ae4 SHA-256: 763775f91aba7c85f54ef8feed922e296c85a43351bcae347e479fed82696f96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The presence of urgency language suggests a phishing or social engineering attempt. Although no scripts were explicitly extracted, the nature of the links and the detection as a 'Phishing.Trojan' strongly suggest the PDF is intended to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=rocket+league+banner+titles+rare PDF link annotation
    • http://sambometal.com/dataroom/file/juvewaza.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9095650476.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f453e72871---21590891291.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pafizebukazududug.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/rasoxomirigevopojuxax.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b4eb90258769682032c68e5681007691/bifiki.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gq9tf8bjjfqb925qhlf351f6qq/rigosopapulimuni.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/82033232753.pdfIn PDF document text
    • http://boldogelet.hu/media/jofokipisawupuzesupekog.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c390dceb2d---xinijumewujivojagejafiw.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3e3c161f1846ef874f48be8da644ca93/laxunodatiruvizolemu.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/xowawijuxid.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5fj317ku6q8l7alldfkhcjcusf/20644045060.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c04be3bb654a265cf1c5dc079da54e63/riwovuwulixarupixumote.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e45e78007---pitejediwatonuzewi.pdfIn PDF document text
    • http://timapools.com/uploads/files/vorata.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/wefarabasusejod.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/90526115190.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/viwogodobezazilo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210607_210725.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/53294765883.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee870b588b---zokoxu.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_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 18820 bytes
SHA-256: 1207cd09716627cc62b785e7a1788caf54a2e948e82977ad5ce88820d1e657b3
font_01_sfnt_off00016852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16852 10780 bytes
SHA-256: aa0022ad55f1465fe3e6dd27c9f22189ab48d0a044a773bbd5f7e2029cccd7db
font_02_sfnt_off00018155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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