Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3fec71e746f637…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 22:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 172c87c204bf85cd36260c288366525c SHA-1: 998a2dd2a23ab46ca336491cc99f52371c729304 SHA-256: 4d3fec71e746f637f9900bc5d1bd19745a4b2931865fa4a6ed2aedba4ce3f534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may exploit PDF vulnerabilities or serve as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://anm-av.de/uploads/files/sekarasonesikifuja.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161397e2768736---voralajusamani.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/76303762672.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/47656208091.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/makexezitozeruruteminoki.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/figalonamefepa.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pegisabimedusugexegof.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359837366b2---99835802078.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/67450695878.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56f550afe---suwewipuwudixiz.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/kunisavosibinik.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911195722.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/5491806161.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/33380452090.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80521726720.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/wafejapo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d48dbb96---semelimazikirituzuwixa.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/92551403807.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/jidojotajirab.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kediguzagitu.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/likajejidudejebadinule.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/75341285347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=latin+words+that+start+with+bPDF 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_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 14600 bytes
SHA-256: b1e183a37a465db16da897fc3a5a7b1cc5512ab4df68d60bd124aad59e573e02
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10352 bytes
SHA-256: 79ed15a16bb15b95fefbcd929cf76c110d14d543d6b5d148c81790a5bd4b87a9
font_02_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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