Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee76b077d464f96d…

MALICIOUS

PDF

82.6 KB Created: 2021-08-23 10:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce7061022c5b2c7b6f55ec38ef9f3570 SHA-1: dc9681d4ff9ccb01ff898c05805536b0e150708e SHA-256: ee76b077d464f96dddfdffff8d11c3c005238af96aea07e34f1f2b8e32e2d7bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or malware downloads. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the true destination and leverage legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://elitstroycraft.ru/source/file/7806747042.pdf In PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/80031774543.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/xilivirud.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/frb533c5sac4pj2o7741h51f1r/bexiboterifajizodipije.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/243ca9b64c027fde9666ab7fd00f7712/zozeti.pdfIn PDF document text
    • https://buka.ru/sadm_files/sipaxupozazurorumin.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/88655643410.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f94ddc00a9---59043226510.pdfIn PDF document text
    • https://foulardfotografando.it/file/90125882290.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kq5sq85q7lgv4kt1mbak38rfue/41444881813.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160e464e16d246---medanoriwoveretoliniwugi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160916a38b9127---18950641229.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca897da71---93743037405.pdfIn PDF document text
    • https://immobilgold.com/file/zoxegaguk.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e812cc47424---62231873319.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e298cfe17---fobezezosabivomipa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2db53fd3ace4cdb27de2b598f590448e/18261661042.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/836bf155f0c50ce689c21bff08389d0a/23072328863.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d459a3d8131---93135065234.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/fuguzagodifowotagogo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34eb524180---dadusegabav.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dukinaronikoruxawunadev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=living+with+lucyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a71204654339b693de562fea369dde2b/jufozefunutese.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_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 17512 bytes
SHA-256: 40d143ecbd405dbf2b423e5a0a31f8d30a9d4ad33c5434b89f40c2f48320471e
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10152 bytes
SHA-256: 6ce8d17afea2039c9717e1d08751f6530a5928fbb97122e8f0b494ac4ca012af
font_02_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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