Malicious PDF — malware analysis report

Static analysis result for SHA-256 e491d81ca3d664b3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 20:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04f3d27802d5c05d2b13ebe61f35968b SHA-1: 18b5f423ae84c4ef471dd8b6b2f00127a0c78ba4 SHA-256: e491d81ca3d664b37c55e0d561d9bc269c1924b8e9e82288f88fe5bc3027468a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wrtour.com/FileData/ckfinder/files/20210917_1C033703B97D6574.pdf In PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/zijuwadatixuka.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/valet.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/42312623139.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/90990384703.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/60384627616.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210915152734.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210919000009.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/fapoguxanixe.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/64819273386.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/30227580942.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/524be0bb6ddb4a9245faf655234f244f/58433372146.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/95181562391.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/4279326736.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/18032309593.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614201e772f26---rafexepiwuredadilon.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/30563528311.pdfIn PDF document text
    • http://opersan.com/file/rusajo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zokajade.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/67163249229.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141f89778450---newalobedewi.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/20420914292.pdfIn PDF document text
    • http://esen.life/userfiles/file/muromagawijitiva.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mosaxowetexarupigufutamis.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/19739708773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+my+hero+academia+subPDF 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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 10832 bytes
SHA-256: f497ffd0f65663d19c62453781de70338ea2b361e99ad51c9a19ff7faabc7118
font_01_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 21496 bytes
SHA-256: 97ab38d288034513c8b752912687e83e7dd5a70e3fcd000e2736b4627c227d16
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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