Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec736f46e0cb73b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 06:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85a8201a5dce0eba92cbf8ea33da3239 SHA-1: 5fde3a908d668c335be83a65eb129786d10005e0 SHA-256: 1ec736f46e0cb73b0ef02d552104e84c09ef1c01c7c69ff568f57be34b293e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://blsautomation.com/ckfinder/userfiles/files/87693930686.pdf In PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kujurinenujonezipuni.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://millecolori.it/images/file/90344425173.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/47889496415.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/femuriwimuwafojibelem.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/libuziteduz.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/taxututetasobitizagavaka.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b7af8c1f78b1a609279586817e7a1b46/75595462044.pdfIn PDF document text
    • http://amdind.com/userfiles/file/31901646909.pdfIn PDF document text
    • http://ukrfirework.com/images/file/36863422469.pdfIn PDF document text
    • http://polkovnik.su/upload/file/43680083309.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/tamovidowodumuzaporu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/36b526ce368873176d718839eef19bed/nupatutidufelawujobu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de897e6c6e---kenafokaruwapukopumi.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/nuluwovuxe.pdfIn PDF document text
    • http://karikatura-kovarik.cz/files/file/25158653616.pdfIn PDF document text
    • https://mkontroll.hu/File/pawizatexovatetar.pdfIn PDF document text
    • https://forssh.com/userfiles/file/kowugukitemujimidusokuf.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/diwugufudorivawelo.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/48353144476.pdfIn PDF document text
    • https://palet-school.com/files/files/83928921335.pdfIn PDF document text
    • http://dsraxys.com/uploads/22170232514.pdfIn PDF document text
    • http://axwelindia.com/uploads/87752388429.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/dixidanebebazegidozufati.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/68276488552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=farm+city+game+mod+apkPDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17600 bytes
SHA-256: 9a179ab1c67453ebca4286e97c7abc1209f93b9b382f39f441db353561c92e31
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 10724 bytes
SHA-256: e0c243193765422a378f6d06a44fbacb5d89824b45c62f44cd55051d995828ac

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