Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acbe3776eccb10b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 09:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00413a077e34f3b0a9333da6bb592856 SHA-1: efa6e9c4ceaaf7e621f170e766026968adcbe4ed SHA-256: 1acbe3776eccb10be5aad2818ed2542581b46007d1cb77bc80d34b8c233a3f23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gardenofsound.com/userfiles/files/94423865860.pdf In PDF document text
    • https://sharenkon.com/files/1193287833.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/19773604711.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/11850383339.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095c137ebfab---loxiropurilisefilow.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/tolowaxa.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/90501757037.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3edbb5435---94764198640.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2a2fff1b61d293fda088a79765d34432/guzizolumuliminesolok.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/10890606668.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/jisapa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6de0a356---gisozenugitoxigasofelamu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ef3b9e36---77880537835.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/90088128254.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/sajaj.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/51616023895.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/7076297196.pdfIn PDF document text
    • http://yilip.net/userData/board/file/18698964102.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/70954919230.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/63500240391.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/vitovoritapivuzebewesav.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/36174e59a85bfac4ee03ec75c3ea5889/retaxuboxuzakirawudijoran.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vuxutenakima.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160987f59ec174---suruwisiwaxunabepidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=trident+auto+drain+valve+manualPDF 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_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 10368 bytes
SHA-256: 2c6cb3385ee331b05e7ef2ee299cf3c998e6056d371f6d8a15a4901f33052b40
font_01_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 16452 bytes
SHA-256: 6de59d13dd0badf25e28add5a01fb1fee0b1bf65a196564a7f033c4d9b45441f
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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