Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b4879ce88ae4f1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 09:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03914c55dd81329b55632ed1c70b9333 SHA-1: 4fdd2b91cd77e646cf4914eec27449d485bbb289 SHA-256: 11b4879ce88ae4f14d7a4333c0085d5dd9291bd9a7477a1745fb3002a725b266
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://residencelesaline.it/userfiles/files/62776766543.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbdbb617b---88999565202.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/56504358555.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/23718820121.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xopafulis.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/14578959540.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/vawej.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad1af58e26---345078435.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/judagalenikun.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/60541083404.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/pafenolabenovesudebo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7c907ea7f7a17c3794f0fe706842bcdd/nezubegakolofiromakufiro.pdfIn PDF document text
    • http://skomi.ru/img/files/file/giduvuwavixi.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/44161145769.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/605589449708b9f4518086a5702942f5/18787182719.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/95419631911.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cf9ad2e2df931a835cd560286ee4267c/nozaxomejokewewajowab.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f015972b67eebebaab5cbb0f4de39ccf/49622709681.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d40d0ecc---vakinuzedegusuzi.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/1016477736.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/rekukelawegafikisin.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/notiranegawexiz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/af102ad82a7e64517c1efe8879b3ffd0/98088843293.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/af0b9dacc3aafa7d45182eccb1d90fee/10914357608.pdfIn PDF document text
    • https://highrise.pl/file/virojabozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=upstream+b1+workbook+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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 20204 bytes
SHA-256: 2092cf9e0dfe55eaf1ce22cd1fc4b9781420581a21c7ff753e4a6903c622e7c6
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10792 bytes
SHA-256: 3abf448b671b6cf08c983f96f1aca09443f47d5f91b26dc112546ed533720fdd
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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