Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d891b30037a6c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 23:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bc1729a7ef198137edd3eeacd70a5ed SHA-1: 39c236b0d9efb88eaf68465f72553506baf6da85 SHA-256: f40d891b30037a6c2f62bb742ff570c8998911778ddfe67e8140f5d6fd9b23aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nissanotogovap.com/uploads/images/files/marewunefokojafu.pdf In PDF document text
    • http://fujiya-la.com/uploads/files/30162943239.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210919_7B6A87808CCB18B0.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/besaxivazav.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/733plm73u2rfdfkkc6a6srfuou/12888147450.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/donudot.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/53155149349.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/37114726220.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b11fe1ef96---13573438553.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/soriwadixokej.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/farokifem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496d3aa0569---51126631071.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161456306d54ab---topefab.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/porezutumenasikigu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/67672368259.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/35915570649.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/pigetukudomonejuz.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/23b721ca26465515f42adff00b13e390/83948803051.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/sezobadezunus.pdfIn PDF document text
    • http://hejia-ele.net/upload/bedodutazujifevupedojop.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/47324378665.pdfIn PDF document text
    • http://vejwun.cz/images/65742054777.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/50458014539.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/vuzedezijawetivivetezedoj.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/manevuxusoras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sword+art+online+alicization+protagonistPDF 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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 15352 bytes
SHA-256: 0841637f34f9a22677da3b42b6cfeb692c4a24e41aa894315dfcd3dd40ddf128
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 10912 bytes
SHA-256: 49d44abccb75f0bb55f799a45110e1476becc6a0d9a01cf8b26f901aaa9451ec
font_02_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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