Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73969e7820fcc7a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 01:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d82bef47f0ab7c7179d10f8a339602c SHA-1: 875b178affe4364fd82a47f07b58085fc0ef1336 SHA-256: e73969e7820fcc7a5735dbbdf46368f566da936a276f0756e442b32f2acccb8a
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to direct users to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://airholic.com/UpFiles/WebEditorFiles/file/25873679346.pdf In PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/badotisekelalerodufivu.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/25699308265.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894a7bd011---10584802096.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/9553080127.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/xosewakukumisuwe.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/19e687a9d69fd13e24f4ec5b9e87e452/sogadusodamijumovovoku.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/52556938355.pdfIn PDF document text
    • http://grupophi.es/uploads/files/685508460.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/xupujevexo.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/76642838806.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/jikofipotuwufuwuvu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a883d1cf782---loxijikezoxagunose.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/acacb31fe5c14f1bb558f8cc3f41f591/xufifojito.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de528ef031---vopumedodep.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/46005749274.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/40158068388.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160833670f0d90---15457790891.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/53034741772.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/95937061523.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/lifezu.pdfIn PDF document text
    • http://africareview.in/userfiles/file/62652520318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=volume+of+sphere+cone+cylinder+worksheetPDF 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_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 11084 bytes
SHA-256: d7bdf4a2798b8c96b36bf62d9c0eac1f7b17e57d4ac65aac6a2ecc71aef1b644
font_01_sfnt_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 16020 bytes
SHA-256: 640d8cc65ed3a5971ba8082bf1a7ea32a3ee432a8cf0f6a4759bb05aa875f861
font_02_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1