Malicious PDF — malware analysis report

Static analysis result for SHA-256 93164bde24a21cb0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 21:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bb25b959ff5204ade4324c4e71299248 SHA-1: 7c6decd0702755d35e5e0e13d3358f91522bc0e5 SHA-256: 93164bde24a21cb0dc216b489f332faf33c10e24a3660a0fc8cfe97d516a5e9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination, which is likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a021f9c2---85422549429.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/10857920666.pdfIn PDF document text
    • http://aven.su/userfiles/file/32268316712.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/74623630857.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109022123335766.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/dasegipuvibiwareba.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/95538606018.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/duvolupedajepubumudisak.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/39114401234.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/28289829042.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/fatamexojatelin.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/fakufo.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/gukafugexug.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/19971341625.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/25287869426.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/detorogo.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/51900503438.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/komem.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/92940060543.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e71ce720---92921287899.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vujpdi133cht08ojeihj5v4ncp/siriruvajik.pdfIn PDF document text
    • https://edex.co/userfiles/files/97260476956.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/79858995218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=introducci%C3%B3n+a+la+teor%C3%ADa+general+de+la+administraci%C3%B3n+8ed+pdfPDF 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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 11424 bytes
SHA-256: 4e44e6b745e7484f81ec79149f5090ba58dedec24e5b2157afae253e4dfcf1b0
font_02_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18124 bytes
SHA-256: c44015c01d5084afa3f059c623fa99339291960f40ea20b523a032faf2b1337f