Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ea635d445ef341…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 06:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 913c28c379b9e30070f113f35f295f50 SHA-1: 5583ece754a26a4ba5472d762db2f41b3b3d4634 SHA-256: b2ea635d445ef34189d75b9f4f1adc20cc59faac0d5afc604deccc1969a52338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ilkyoukais.com/Images/Media/files/kasikanenepufisufa.pdf In PDF document text
    • https://agatanorek.com/files/file/82141414029.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210626_194420.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/11772123650.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160819b1d3c08a---8753310525.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074caf3ecda9---12091041284.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087d12d34fac---99109401494.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bexapigajamibobolixo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a99fe5d2f871579f8aa9b3e738161a66/lufusedigisixuwid.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7bd0faf71e91563e467ea22735897ed3/39969320332.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/263a5f55d64d09c790624c48a167de76/19916842833.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/29884062b34a2b7c8edcb3e1981a6331/74126669662.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/83694926219.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tekowemukedogetepewawov.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/31083237229.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/fexotaw.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbabbbc978---97008043563.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/53474414609.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9d516f95---11650652071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=new+york+workers+compensation+manualPDF 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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 10904 bytes
SHA-256: 196b29f863eed4c0703cd1fcbea0402eca61f26412ad8893a3a787ace9080315
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16724 bytes
SHA-256: 5a46b8a81251ad0edf2376d22cdd5331ab6851d391fbeb94cc949f00649afa2f
font_02_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1