Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58ab1a7e46d61ca…

MALICIOUS

PDF

54.5 KB Created: 2021-09-08 01:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c781ce70c6681efaba27e8a075f401de SHA-1: 2f0464e2188ca9baf4c6e7b6549d29ebc7a950af SHA-256: e58ab1a7e46d61caec95124c9bde7685246de86c6b90f3e4b4abcd892e084dee
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to download further malicious content. The presence of numerous unknown URLs, many hosted on compromised CMS platforms, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trevelci.ru/ckfinder/userfiles/files/67191081086.pdf In PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/zujuviweravefeniguzixuren.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc037bc4c---67188190940.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/38032468017.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/64255297125.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e308d3e4---69116833160.pdfIn PDF document text
    • https://2acontractor.it/images/file/miboza.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea3e01c5---felazijegijizux.pdfIn PDF document text
    • http://schubert-hh.de/image/file/8121021552.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/30194526056.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/wevovorilexumovaw.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/13282121676.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/51452245423.pdfIn PDF document text
    • https://latework.cz/soubory/61174900738.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/kisimogesokegaloz.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/74597248870.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9bc6d1644c3f4972a453ff62dfb38ffc/garilo.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/14004211087.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/ruzoxibegojoxujoganiga.pdfIn PDF document text
    • https://jensbrode.de/files/file/bigolosijexutupazuwura.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/90299443590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=child+marriage+restraint+act+1929+pakistan+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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