Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bb1d45ca1e4e57…

MALICIOUS

PDF

100.2 KB Created: 2021-07-16 15:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 713f63c846600e3d6f2950dc7bd6df33 SHA-1: 4ad00bae269b90f3d9f645f4e8cbbe972fd5686a SHA-256: 75bb1d45ca1e4e57d31268a8c9d34fd878c3140961d448759d9386a39a5c77b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nomylo.ru/uplcv?utm_term=town+and+country+motors PDF link annotation
    • https://gujaratisamajparis.org/upload/files/xujosoxufaw.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/vodesuwin.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/42457902556.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a615c42c6d---14974543310.pdfIn PDF document text
    • https://kawanmto.net/contents//files/vibekekatelaremajewevavu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e895121c27---28216884944.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/19275036056.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/83675286991.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/50997191784.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/113f46a56b8f475ee278029c5fb5b8c4/33423118314.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/jawodokun.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/45018787664.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/donoderexonasusozute.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097719e17de4---95509871263.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kabamejerawe.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/19/file/20210519_131817_160.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/2784543893.pdfIn PDF document text
    • http://quaint-house.com/56970143599.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607686df2a4e1---nizuvubamonogapidinanug.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/64417140937.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/jetesaliwufig.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/79085018105.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4v7lb4vkseg42ourtdeo3fhlk5/vebopakekojetemixebewa.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062102333973499.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_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 10524 bytes
SHA-256: 6ab3cfd0d8d18e5614911cb397e60ad3e5ec6220a81505ee3c4b87d09fa1ee3e
font_01_sfnt_off00013ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED5 17096 bytes
SHA-256: d6389ca98a8eba5889bfd6e50a7c8b2fed09d4cf06d2e6c7bc3fff2ad4d2a149
font_02_sfnt_off00016b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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