Malicious PDF — malware analysis report

Static analysis result for SHA-256 53322906baa13f46…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 10:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cab8692b75b2f868f15cc6295a185e48 SHA-1: ccdd79d4c9cddd85f2e6a00bd81b3190c04c9b8f SHA-256: 53322906baa13f46c03d138717423adf172fadf27cc2a3782abb8684d18a09db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=the+old+20+pound+note PDF link annotation
    • http://ngoinvest.com/uploads/ckfinder/files/vegutisegogajoravu.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/67711633958.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c990f9463da---45149656071.pdfIn PDF document text
    • http://kids-ex.com/77880835569.pdfIn PDF document text
    • http://atek-ent.com/upload/file/84077059337.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/lakepigibududo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nibojimewode.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/14889169554.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vuzusokefasu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9d9597dceb5148821c57b18edd22600b/zotewegelagepabuvab.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/76761645011.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/84332229316.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2k6us6asqhpou1j4e1k2deo5f2/52342662736.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210629184558.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0a61a59b82b7b4587d02e70bdbf406a3/merigusagozokir.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/35487667389.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/affbaff5742372a874f73626e22b9daa/wakipaluvalur.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gidotovu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84dafe247f---76698988843.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/fujufadoz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a011e6c43e744ce5cada8e646b7d1290/10503061332.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/31105555060.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/9734629851.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/70273142130.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce765d6806---jazawodeborop.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_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10272 bytes
SHA-256: 1d97c894abef764078d00de857cead409f7112ce43cf4d796097c13e599844e0
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 17116 bytes
SHA-256: a1bbe1c93ec2a2d8c7a56e055cd9e8bf53ca45fee52aed229e94e918ffc62799

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