Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b4a7537b0766ca…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 20:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d40071185be6dbfb9bdd73d8b1278be SHA-1: 8f67ea94a43f9aa47ddf7a70217341d5ac8bafb8 SHA-256: c6b4a7537b0766cac53ba67eda88740166b7d03b5d4a1d4e5c9cf03f2dc4e1ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, likely for phishing or malware distribution, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc2e1333a---81244311684.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/nuketisazaruputeg.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/21594717048.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611d55224253a---64018952913.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/59031422358.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa13c75d6a---kadopexavipufegulopu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a5e2e9f17---sovubagafitomevavup.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07cc4b174---dadabuzo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/99221891512.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bce23f4c42f---wirew.pdfIn PDF document text
    • http://sns.hu/_user/file/lafatanorosaj.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/48863335540.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/39378046888.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/14501088519.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/talejozu.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/dotuxaradatusetija.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3fcb34619---74672689494.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6987ace940---58667268642.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/gifilagakopit.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/g0lggi8483al9hntehrov91hre/81915767532.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8dpm1cqiqqe4kiu4bf8ogaue4g/66677145289.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/97315550222.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rexififivadudojevu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/14588584874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nickel+and+dimed+book+pdfPDF 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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 10624 bytes
SHA-256: 3ce18898e130db60054fc9941e9d240964314159384b3ede3452a1812b2c7800
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 18608 bytes
SHA-256: c0ee7486a7daad29f6e3798a394e469b46834b55c2ed7a2b4ba19e44f25c162c

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