Malicious PDF — malware analysis report

Static analysis result for SHA-256 577f9f00402bfd2d…

MALICIOUS

PDF

73.2 KB Created: 2021-06-29 01:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af1ef47111d70ca2979cb171f6659c95 SHA-1: 66a9ac86e45001216f6b825e0f33a0114b4cdc4b SHA-256: 577f9f00402bfd2d1f93af66210950e2ceba540054f388eb055ed0874bbb671e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent beyond URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://catamma.ru/uplcv?utm_term=squirrel+in+armour PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/39c875f0b68076418f9301e43b167389/lewisezetulavatepon.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080980ce3036---fevevijegukid.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0208c6638---sojodezemeg.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160804aca2b9a8---23159371978.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/749c31004818ce2af560296640f1d989/85336759709.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba668b384af---22684794777.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607753fb9f263---vuvisesuwaxez.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/k728jqnlsuc3h8bm1fs29eruaq/muxitipesinirezikamorit.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16097656786622---42118657756.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/11567409828.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/81b4d3b839d9445b0b6cff89fe95344a/jajaminupelozosepu.pdfIn PDF document text
    • http://klpa.net/userData/board/file/fesaf.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2eca7404e---40266675259.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/bigojegik.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a9f14bc92---39286828531.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708258a74e4---xazozujaxotagaka.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/48993757901.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077779c23c07---xapukof.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfe653705---wibonafixe.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e61b4cdc0c600fec3cda4d01358a60f5/bawatonekewixisokerizeg.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaa5015965---41295821131.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd21e3a12f---wabofemazejulazudisevuvu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/guzikafanolasegopajit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017a46c8af---wotorowukilajimikuliwevod.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/46t617p94kemrcgjuui02h6o0d/wojowipinobusen.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b8ccf1bd4f1aeed8524588722b0278a8/rikike.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_off0000be28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 16292 bytes
SHA-256: 440e545a292e7084eef68ee99c162e518916e562960e14c5b87f7b1e4edd4d83
font_02_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 10324 bytes
SHA-256: edb049eaca3c5f1dee9fd6de94a4a534dc37dc3b1c0e4028ce403dc92949281b

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