Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b06aa8ed0805298…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 06:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c486e1a728a75dfddb805a490ff2357b SHA-1: fb32bd4adf22d82de98f47305987bcaf20408b58 SHA-256: 5b06aa8ed080529885caf7f5c47156ebec4bf649ec30ac1121c33516fb994d1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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
  • 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://philabc.ru/uplcv?utm_term=windows+8+kms+activation PDF link annotation
    • https://arhometutor.com/userfiles/file/5863528321.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/wugibe.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/642c4045e91786001adc9067e51d843a/13591265762.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/konokogipidariduwenoja.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wemiwusokezojibexego.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/90555829893.pdfIn PDF document text
    • https://ka-base.no/images_students/files/pubikonisinotuviwetel.pdfIn PDF document text
    • https://artenika.pl/fck/file/54808824044.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/voxigusabuxibotuvakap.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lifuvawuxijasesutekoto.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zarirusopipagurumaren.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/86161716456.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/lisuwime.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/43819324649.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2k4rimfomfm7llk0bl426v3j0q/lifixitixigujopixitu.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/58248150935.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/gogunexifinonalavitemod.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/20167012755.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4621c9b40---46143025420.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9ec415cafeb94e2fd4360a66fd738450/37072426874.pdfIn PDF document text
    • http://tzsunup.com/upload/rakabilegumexusami.pdfIn PDF document text
    • http://klpa.net/userData/board/file/77899988687.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/42050749656.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/98655928183.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136de4340ab9---4946031896.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/88319710011.pdfIn PDF document text
    • 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_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 18080 bytes
SHA-256: f473d35fcff4cbb4425850410d1f06fca65bc82a47572dfaf9414a9efbaf004f
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 10700 bytes
SHA-256: ac11c83b69ccd1d45144479d6d5c3dd84d089e3db721e91c34f620475ea1daaa

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