Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f6bbe687949ac…

MALICIOUS

PDF

78.3 KB Created: 2021-08-23 10:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff51a5e7898e2d7363ec6727d0542b8f SHA-1: f0f32917e10d167e2ec9c6bf0915889e5da1d5ab SHA-256: 886f6bbe687949ac7f806f5c19b9e6456387468618131be360e0b5d9fdcd8076
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of a secondary payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting a tactic to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwallendorf.de/userfiles/file/42523527389.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092f71560768---kawosebarudumoji.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/80532344891.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4db24fa748248e62d1bc374c907cd31a/wavubasixig.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/67753082364.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba8e07310---birubujosarev.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210707_001052_8225.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/66305834093.pdfIn PDF document text
    • http://innotack.com/userfiles/file/20518636658.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/26385245786.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/39850420275.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/nemedu.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/66225373153.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/49266812995.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a509e9089---72821899570.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/gofabigezupulitodumodifag.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/1359468888.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/41735380153.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/23734672983.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160836afdee1e5---tuzelamamoxegajujejid.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/69242044124.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fc0a2694de8d64d432171e4e922e7291/lewedemibebeto.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/86406515945.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/31890952775.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/74998816698.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/21465779222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0334266664---86977855109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+file+to+powerpoint+converter+free+downloadPDF 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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 16520 bytes
SHA-256: 281e8417c6ba293c68875994ffeb047262d0708f9e19a08ccb23e5dd13174e8b
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10596 bytes
SHA-256: c88741bb4e70695e4c60bc5db9a626c37649315f4a4cc29e709a7531b7e06e3f

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