Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b45bc61a9380a…

MALICIOUS

PDF

86.4 KB Created: 2021-08-15 10:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8da8f56801e3bd19689e08cf84cbb0f6 SHA-1: 929447a240ccff0205d7f53cf95d2ad201aa149a SHA-256: 781b45bc61a9380a53008e173482e8fc3da75744bdc400b4c5bb07b6adb58b44
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 disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

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://grandhotelbulgaria.com/userfiles/file/80821892463.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16109bc8980c87---56910282710.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e1fd20a8d028571dba87f85ed1805dcf/37228681349.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/wikisifimuzozekogiporez.pdfIn PDF document text
    • http://kisito.com/userfiles/file/40198711251.pdfIn PDF document text
    • http://atya.eu/files/file/85372941526.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/jonuvati.pdfIn PDF document text
    • http://erex.hu/upload/file/wegegulagegezawol.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/pirolipasi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9a0d5b51---kutifipirafoxataveb.pdfIn PDF document text
    • https://arerp.kr/data/file///92272035639.pdfIn PDF document text
    • http://henca.com/files/details/file/21780895907.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/96301078039.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zuzesunin.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16109b963bd2a3---vimogigomakalozizopevafer.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/28049996622.pdfIn PDF document text
    • http://hanifeugur.com/image/files/fuxumoresevutiwepokobo.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/21815169124.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3607ab131---85859652589.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/gusapa.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/93408503264.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/zusefexon.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/585b66b802305ea23568ba81c83f47ec/98018548705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=d%C3%A9claration+partielle+de+succession+pour+l%27assurance+viePDF 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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 19028 bytes
SHA-256: cfdfc8d4e4a9b1576fb93f32c06189f274b9d93e86ebeaeca135d206ae3d5215
font_01_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 10860 bytes
SHA-256: 0ec8e8f9f481766f12ad9c97b36175ce3ddc79e12446c0417107c3877ba33ace
font_02_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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