Malicious PDF — malware analysis report

Static analysis result for SHA-256 576bee10ef684a53…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 23:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00b2577c81d1eb2b180ab4057fc6ddbc SHA-1: 7b70f9aea512031d64471c664537e06e866c8274 SHA-256: 576bee10ef684a53368152b1c11299710705405230441f4cd185fa85ed32b504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised websites and potentially disposable hosting domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using compromised infrastructure to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://galedo.cz/www/data/cms_files/files/dejuvudevizitakus.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d557676b5f---mugut.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xaxuragisiluwebajate.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7fbaca7dc9dab656b7343822b5b28ccd/jovuferixokitanadotak.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/90899777610.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/210911061512922511ej2xvrwcicj0.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/34705789813.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/figolifumuwev.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rowojivawopidarug.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/98497726600.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d923825cfbf3224133e3cbba5a0f28b7/16727961192.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/81345935270.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/52838494735.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/99924737902.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf6f43406---47615998825.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/22919254533.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/89597345110.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vogolepam.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/bozezegoxukunedi.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/3074585840.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/40134199810.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/bagufibowuxupo.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/rolajozijamu.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/49326544909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=can+you+trade+in+an+android+for+an+iphonePDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 17460 bytes
SHA-256: 50242d60f5c923a173dec5900407bb63d11f085a8fe22f8e661c9e491d80248e
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10628 bytes
SHA-256: f2633da2b5257e1df392b554a5b028122beb93b6fb2714ed32213f8ea8aca69d

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