Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fe06037ed4bfec…

MALICIOUS

PDF

96.8 KB Created: 2021-08-10 06:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: deb629a0bfb67d3245ecc99a2dc785ce SHA-1: 1006986b53a945391d3c6381d08cbb5437c84661 SHA-256: 51fe06037ed4bfeceed153afd2385a2b7502471d7a85783215a07412012085a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and the nature of the links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=que+funcion+ase+el+sistema+circulatorio PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9bu837fs7tnsp10vpg9iiun2kr/darewosabexunoxop.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6c7f6b44255639f4a074f5cb32a7b8b9/dopajukik.pdfIn PDF document text
    • https://blugarden.eu/file/6578187507.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d88ca3ab---76887743629.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/801465e34fa44ab428c42e8e92ca85ac/95667116965.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38075612389.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3f50f89d67637f18d39ccffca057767a/fematobuneta.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/28f862a63f97626f27cbfd90a2556e6f/bujovoradupukomivofapev.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bbd5f1c69---6010701079.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609974fb0a141---65464004239.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/45231947811.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d46d8f5927b---kotefezabepazekobawelogu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e97eab16f10f2e6fa7bfb335467204d1/51169616944.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/r61huk5gbhnvnmqpoej56g68j2/tumeketuvagotoz.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4991d9e78670a0a0f6d3e23b48c56fa1/12824362322.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/wajidajeb.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7fa56bf996bd37ee83ce777dc7c1f95a/divememanabisu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5db4ef20sv1bs14vu1j4275kbc/napelu.pdfIn PDF document text
    • http://midel.me/userfiles/file/kexewaruxemaz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27ebdf400---70670295594.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/wozavabul.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xofaketoda.pdfIn PDF document text
    • https://activepymes.com/pub/file/davixatavidotato.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/kuxizimejasagonukoxa.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_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 17900 bytes
SHA-256: 836d5b61e3502b21db5c77a025f76427dc1b7a69ce75d8af70e435155975bece
font_02_sfnt_off00015bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCD 10656 bytes
SHA-256: 725bb90da5793fee3029d4e5ae38b24201b0354b78a8cc28d0aeee02efa47d12

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