Malicious PDF — malware analysis report

Static analysis result for SHA-256 017bb71eb04b423f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 13:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d636108da5ddcb32f6766e1e593cbe11 SHA-1: 21b00f2dbbe1bc59369b4ecd12ebc7d88cecfe36 SHA-256: 017bb71eb04b423f43ce3fe9039b3822360dd1345f9351fddb9b545d60c58007
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external links, including those pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://thinhhoanggia.vn/Images_upload/files/wuximunure.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xekupaku.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/75359096248.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3d9c3a3cd8830880b66d36a01fb4d90f/72475325396.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/zimuko.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33838155704.pdfIn PDF document text
    • https://kamedia.vn/data/file/25313066024.pdfIn PDF document text
    • http://protok.pro/upload/files/tapepagewapijadiw.pdfIn PDF document text
    • http://huefpdf.org/upload/file/nureloxipujadizubogin.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/59897648075.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/38267760506.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8934b1bdb0---98541111815.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/zimopofijef.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/7544538626.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210731085013.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5195d04d7f95e4e0489954850c26295f/74502639901.pdfIn PDF document text
    • https://austarpharma.com/upload/files/56007332236.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce37088c---49047167574.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f7cd7204f---7550819424.pdfIn PDF document text
    • https://quizai.com/uploads/files/xupilomafageteze.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/22527705977.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/6074093227.pdfIn PDF document text
    • https://medius.sk/userfiles/file/56036927055.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/54249714463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tricks+of+math+pdfPDF 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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 10660 bytes
SHA-256: 4d0b41dccc1a0df7c67b65fd1032acdddea5a947b49f47d7ff568bc1a6ff8e55
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 17320 bytes
SHA-256: d3bace3e7f17317cf8dca75c91a66984e09cc383992168e03c9848ea17b935e3

Open this report in the interactive analyzer, or submit your own file for analysis.