Malicious PDF — malware analysis report

Static analysis result for SHA-256 027d5d105867e74e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 22:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b60ab87d1951696c85ea12a0b559e25d SHA-1: e0133c80835e47c9f98a8f97cbd980199e631de1 SHA-256: 027d5d105867e74ebaf25e3f539e87766e19875d4848251dda5db941636fb7f7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware distribution. The PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://caramelitos.sk/files/wutoliwugoxazivebat.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2gs06kse6e0je13dhlju2n4pq7/toxagejulogakafaloxaxige.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/94887758043.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/xomulagojivap.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/natitugotevegusadif.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/09b6a109d0177b4d07a470053c7686c3/82149898342.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/99108802590.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/gusojofela.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace25cd9c00---befigugik.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0iniuj2ufh0j2ovtbpqht46mmj/27378695792.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a6bdf534a4e2796152c30c7b26d07717/76541954342.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/ruwami.pdfIn PDF document text
    • http://artdental.hu/editor_up/motefoduvo.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/tegijenusitun.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hl89t7prsgv8ptbnklg5unh2s4/91823620472.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/18776104776.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/lenuvapovib.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g3fnkr2vcc6kjeq11bhoc28c83/82678442763.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa02a60263d---99224624431.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/puzukala.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bapubovu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b776cbf05db---70934845471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=reasoning+class+notes+pdf+in+englishPDF 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_off0000b5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 10844 bytes
SHA-256: d909c39064d666e3345a8da02cc4104097d63204335656162b295a9bc68ff2ff
font_02_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 19800 bytes
SHA-256: 635f0f3e7ec01120a84e67a1449fb593fe00bb1ac34f684b01f3ca60d2de3d8f

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