Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ac2cc4a33ba0d5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 02:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de26d930b9ac0157da6a765a858c6121 SHA-1: 9c5dc4be2894bebc914ca40807d410f94d14e00e SHA-256: b5ac2cc4a33ba0d5e8cabfd1f885a12967a0ae9084d2042095480fa3234b5494
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.scmsgroup.org/ckfinder/userfiles/files/doranakaxovi.pdf In PDF document text
    • http://revucue.com/ckfinder/userfiles/files/26454358756.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/rujuzekimovexoneperax.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebeb94d907---zuvowud.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8d1t9796u1gej2hk2qnansg440/lineviterim.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/80074876324.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/madixez.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/gifazewivowisuniraxajal.pdfIn PDF document text
    • http://methese.com/upload/files/tunut.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/suxesegarinive.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/94498271574.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/28246999579.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/79874169348.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/56503955706.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/xenokapojakepewifenuluvip.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/54961202203.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/57524148884.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fb900dd97a07e7830251018aa66c96fd/22185203389.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/botudilininaremesof.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/6877804699.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/letijapovop.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/gejorojixolewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=definition+of+curriculum+in+educationPDF 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_off0000bd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6B 10572 bytes
SHA-256: de91021b9e97bb031e475fde4ecf94d797e06a37f2c53c664d5fddae5f941032
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16788 bytes
SHA-256: 6deff1d1098a65411d44891318480795d5a5d41c011e67a4773479e9a9622545
font_02_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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