Malicious PDF — malware analysis report

Static analysis result for SHA-256 d418e6b2aae29e33…

MALICIOUS

PDF

83.7 KB Created: 2021-07-26 12:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 78137901f31924e680c5a2fd524cd43a SHA-1: 274e8861e16db79f66af9ead5b8021ceee52df17 SHA-256: d418e6b2aae29e331d057f8273e0e43773f15bb30c49eb2071d34f198e7e8d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve as a landing page for further exploitation. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://accesoriosalmayor.com/images/userfiles/file/pututugasugopefub.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e49ded38---59323409327.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d6a68fa74949cf6f78a0e53043007b31/72627933746.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/59686930584.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/rutasosofitinujaxapul.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/10449904685.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/89733416990.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fbae15eddc49c94c667a2f94cf60cc0f/wepagopabodobijinixip.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/wafagesekesubigap.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aec1cbb70b02b08e87e9fc42c77680c5/61340395378.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/11838470107.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27109804429.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729f9bafffe---5713215448.pdfIn PDF document text
    • https://signika.pl/Upload/file/86181866052.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b490ee96a3e---17997964418.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a729092b4---7466514419.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/teluwepigoxemoko.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/vokaratuxiwomowujojuwelep.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f5682498---zilev.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a050405136---joridoruvos.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/jegonupifawikunap.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160902a7dda11f---fapomide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=worlds+together+worlds+apart+volume+1+4th+edition+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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 11320 bytes
SHA-256: 55e573e1fb3281cad9afb6292f7d5e9da71bbbec8dbecf2067d4c36869af9f79
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 17760 bytes
SHA-256: 0d859b64e1865d9da3eadb5ccb7e5a9befc59dbbe409af84e2b0e82f8c0bf943

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