Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bc1f9c307f519a…

MALICIOUS

PDF

73.1 KB Created: 2021-10-01 00:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e7213f0277c65eb0ee5dbf744e935a2 SHA-1: 2bf5dee2184e2d761054692d972d6dbcc4b1c60e SHA-256: 23bc1f9c307f519ad2bcfb8612b38d865af4b9057925bc28f1b24fffd7a455e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains identified as compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's likely a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wendi101.com/userfiles/file/vipasowadonizenowemebup.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/bibaminixuj.pdfIn PDF document text
    • http://julianina.de/upload/file/musalikipuliwe.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/36393837118.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/zekak.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/1693365339.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/lurugokuwixejiboxujonug.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/76189383024.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/40092488803.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c8cc7940---zumenogobubezuzunovuz.pdfIn PDF document text
    • https://reha.bg/content/upload/file/78912151493.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/tofatikoteliwoligofewiz.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/fogupekosobopemagowupinaf.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/91578929762.pdfIn PDF document text
    • http://sparkpro.lv/content/file/jitux.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1dff3b575b4d13adf77a8882e7b05824/mosusefaserogakebilotuxu.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/2883743419.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/69948187797.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfda52fe---xozomaderejiwuk.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/fuxen.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/jiwijejigi.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/xibosemuforikevototoxifuj.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/vodalodal.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/45339748162.pdfIn PDF document text
    • https://teamcode.net/upload/files/89614599319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+fake+gps+location+on+android+phonePDF 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_off0000b744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB744 17488 bytes
SHA-256: 8fe83cd0f06af14786e0bfbf84f2e023d9bf3b751f4a7a9cb1c60d51794e3a89
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 11068 bytes
SHA-256: de1072f769d82e46ab07cc668ef06d97cffd43e9962050115e2fcadecdc8299e

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