Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58b508743583d36…

MALICIOUS

PDF

81.1 KB Created: 2021-08-30 05:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffb5fe9cb40ab324f5feda1537954a26 SHA-1: 8527af737121b07b1a88f12892c9b5e48eca56a8 SHA-256: e58b508743583d363ed2355d1f8ba9b6e1e89b64983de18c495f86977a772c36
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links indicates a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tktravel.shop/FileData/ckfinder/files/20210624_329C81DDD6CBF088.pdf In PDF document text
    • http://szentimresiklos.hu/upload/file/77547908778.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mofejidujejedup.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b1053c61---53721623210.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70346743150.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/mobiradotoriguturovu.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/73081385334.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3e2a2042---jusiwefijugofofiwo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/bawelapazi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/fc21f455ee59e7bf31283bd2cfc500a4/wefodaxaked.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/buribulam.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/54473089460.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/20482261681.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7250b2fd---jewuxazeje.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/94892042706.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed41e9dca---34536689860.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fomafotola.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/gusalaperidopedirujosagib.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/44662111696.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a650b3c49---rupavixaxovigiwoxunogija.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/kolesanibez.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/39010327508.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7765ae96bb6253d92c8bb6f19dfeabf3/42132875781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=developmental+comments+for+self+performance+reviewsPDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 17052 bytes
SHA-256: ea897cff9906c9275077cf0de50cedf391108fa1955e6a81c390e78dc6473ed3
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 10796 bytes
SHA-256: 89a9b82cf960a945de478219e6e1011ef50406c260de99a17c6c420d8189c7b9

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