Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac93c71a5eb788fd…

MALICIOUS

PDF

95.3 KB Created: 2021-09-24 10:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c61311ae81e91ebe18eff0a19e519c0a SHA-1: a00e66b6b531eee02ca1c3b7b83aef84ea8d2d3c SHA-256: ac93c71a5eb788fdaf523712f335dfccb6e32757679c5b048b83f5092ca5b526
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the nature of the link farm and the presence of PDF-specific heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hotelamadeustorino.com/userfiles/files/95666742445.pdf In PDF document text
    • http://camonetinternational.com/files/file/35891949765.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d35e3d9496---javivimanesisitu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319b4ce58ec---83774264119.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/39790984522.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/dedeworaxebisejilokasa.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/53443708160.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/mofagozuwimut.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/96424359903.pdfIn PDF document text
    • http://iknow.pl/files/file/zoxudemirixoxodovadil.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wesaxavasub.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/81122529880.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/2807805260.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/xowedogapawitup.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vozokininegagezafefumuge.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/maronodetexanuguji.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/nivukosadogiwixikev.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/66256091733.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147db07294c6---zexizesasilegos.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbff4b6b84---botipojajaxetuto.pdfIn PDF document text
    • https://shunnasato.com/13175976789.pdfIn PDF document text
    • http://jump360.co/upload/files/20210912050507.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/rusuxiwelirosajibonugar.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210909101416_NzYzNDU5OTA5OTI=.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xusugelan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hentai+simulation+games+for+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf0f3c6ea---56937115323.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_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 19176 bytes
SHA-256: 1d204259f392ab0b428ff10cc0b969b4e274eddd884eb3ce268e553773853ffc
font_01_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001572f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572F 10788 bytes
SHA-256: 9424b77cbb6aa58ed5c79e7acbe8fe8208e695d55541f6fa042bc42b85a6b092

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