Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd76b14bb904e599…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 08:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 115ae7bae156cae61145e9c4971f8471 SHA-1: fc66dd7a2bddafecfbb9797dcb48bd4ed7c06bec SHA-256: bd76b14bb904e599f24de7cf9edc391a35b95c28ba67e81f4a89a44f92c5b685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e6e01401---vutule.pdf In PDF document text
    • https://webaprint.be/img/file/vizefekoxikijenifujuvag.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318ff3e9778---45576148023.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/fafila.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/nezegurapesivumum.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/zigulabaxasu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/2906999469.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/gofodoromagelemibunudopu.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/xetilefaxisepaweriton.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a2d3bf0c9---vufesiga.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/63561310055.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zuzumuzivej.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/lasevusikulir.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/84748846706.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/kitow.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/62722177919.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/61366882930.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/5724109654.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/36101504877.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/35216406998.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9094efaf---suxasataderera.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/95157807081.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109052348526781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=house+of+hades+graphic+novel+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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 18052 bytes
SHA-256: 457511d116314995c785c590361856e8aca8e7c8249493565f2162eb5998b076
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 10956 bytes
SHA-256: 16b419bd7e98e681f269e6f9138342cc144aa1f6b6c70023b7638c6938023cc5

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