Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24a95327f73d588…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 09:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e1e15f42ffacbcc046694edf16db722 SHA-1: d5ad57badd2523ad5b8d384a795bb72e61531651 SHA-256: d24a95327f73d588d6d95e00dbdc04dbf925f6b92f4048cfa1821359a7d5eb1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=how+to+delete+duplicate+photos+in+android PDF link annotation
    • http://dispensapertutti.com/userfiles/files/13182522640.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/29256566777.pdfIn PDF document text
    • http://holzweiss.at/mabuk.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/bevizujiz.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/12502397494.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/24339666174.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/30095800431.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/48510394040.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/wuratus.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133419b6598d---gumoxarim.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/16321117077.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/lezutojobudupiz.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/55586159842.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fa323036---72579056086.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/80689425605.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/xaxakoxakero.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d2a06bfa---14415765161.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/dorunudavuxos.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/78091479112.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/tunexadadogimilisewo.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/17953368563.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/vowirobemonesam.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/wamitunidow.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/nadapewovu.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/81350653705.pdfIn PDF document text
    • 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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 18308 bytes
SHA-256: 0785c4c41b36021b2388218fe9a24a15e726860cfbe47a8e2a60484057d0367b
font_01_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 10788 bytes
SHA-256: 113c459d71e68f6eaf096832ee2d3a3ee8e5b943c3c2f12ed41d7f2ff15c402a
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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