Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb24921813e4f032…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 02:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9054807477982e2d7c1f03445d75be1b SHA-1: 502cb464d031ee53cbbbe4e993194e1e8133f6da SHA-256: fb24921813e4f0326054ef12b63a350a23eb62e8d6285aee28ae55bb29da5e9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions that redirect to various URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely responsible for initiating the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://etpatatietpatata.com/userfiles/files/nifalitedeboraxajisoti.pdf In PDF document text
    • http://maschimaurizio.it/userfiles/files/boperinetuwebefosi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff53818c7---lobunikewepetivevodabo.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/28738771652.pdfIn PDF document text
    • http://pmke.cz/pictures/files/67843981190.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/40900108236.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/suvewimuzif.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/34916837671.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/vesube.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/87641670249.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodiz.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/28857178393.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/tovufitapolixef.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2b23ff48---xosevitarikoxenokab.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/091436089019.pdfIn PDF document text
    • http://strahyi.ru/images/file/49140062985.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/20052198571.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/21414979526.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/42173618606.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lurifexivafivavaf.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/55875876677.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/givoritusikifiradivije.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vumuwud.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/27283186516.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/25557348725.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613690b925daa---xidujeminadepoletamav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+turn+off+pop+up+blocker+on+my+phonePDF 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 15972 bytes
SHA-256: d105812b445f7de662045c8b7ce8063be721d0baaaa5ee092f30dbf5c10f9480
font_02_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 11076 bytes
SHA-256: ff5f6fa743dc88414cd886ee6371fd957d2a04734edd8843d850abf885862ace