Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27023c5c857714e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 17:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 908d584d6054e8c22a6ec58743373b29 SHA-1: caa1f6a019d0255d429894dbb1223acc05687e7e SHA-256: e27023c5c857714ee598c4ea4a3096d84454c3a710b04f88e068d85a8f5707aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://satesayap.com/contents/files/15614143264.pdf In PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/vivix.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27535ff94---25395674941.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/35638322532.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/fagibajinujawulavu.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109041321514461.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614171342630a---tinaruziwenex.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/58788569400.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/sakatisade.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/tezudutogo.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/35143508570.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/vavapovujodefikidil.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/4113589271.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/16446225106.pdfIn PDF document text
    • http://quinta.cl/upload/files/bedarosaza.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/13705752497.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/84535789678.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/51437528708.pdfIn PDF document text
    • http://opsir.eu/files/file/sedoriz.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134167e98f04---99878089970.pdfIn PDF document text
    • https://blugarden.eu/file/57684385508.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/mozidom.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/20142670657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=2+player+running+games+unblockedPDF 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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16664 bytes
SHA-256: cc64b4fbee2d5582f2fac0aeae8f9831651974d9c9a1e177ae8b2f2937fdf7b4
font_02_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 11228 bytes
SHA-256: c1fb556a46b0d16489b210654ec12e7a415913d7ac108eb505549f81d716ee39