Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41a1a6058785d67…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 14:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79d9b8951d5ba40b6ff2ff019a2d1fb1 SHA-1: 3b65e63fa109891322e1f2b452bd793159e8bcb3 SHA-256: c41a1a6058785d67d27a94d8e7df3445e5c6a6129dc1acd59b67d11b41ffbb9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://catamma.ru/uplcv?utm_term=star+wars+no+disintegrations+pdf PDF link annotation
    • http://studiorinaldibedin.eu/userfiles/files/wetove.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/femanunapuvixejobi.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/5211854895.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_812D761D8B743457.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefitobulazulotekebanib.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/9565530249.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/fogupujatifilefexug.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270af88017---3700409192.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/wunoripativarik.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/josefetivesavuzup.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317907a3de2---matexumudaxabomijo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/rotugobasot.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/14324681740.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/480709d44ed9bc8d6cad91df551b5809/xepiwomolevegogi.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/78370995028.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/39203740485.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/veputusanibeg.pdfIn PDF document text
    • https://el-tall.pl/pics/file/ruvemegazikifufusegugu.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/21106797744.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/86058085439.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/95963482409.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/87816553277.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/sipizexonazeser.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/movunefer.pdfIn PDF document text
    • http://linker-apps.com/files/jewozifuzuzuveme.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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 18492 bytes
SHA-256: 373e1cf7962de9253bc2cab66e06d4778af7545d422a2487809552986eb7851b
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10788 bytes
SHA-256: 57ead2d816e664a491e3e3e57b0e6a62cddbfe385b663935d3d73a929197243f
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1