Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eafcbac25b7bc3c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 12:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dc76d5a57353c682f3514714fdb354a SHA-1: 558acb512fd17b75b8f4c917f8fe4d0c3ce9c891 SHA-256: 9eafcbac25b7bc3cad779a72bef61ca8f48b8e3e8e94671fbb8c0936f3bff2b2
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of 'utm_term' parameters in some URLs indicates a phishing lure, likely related to software hacks or pirated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=amazon+prime+video+hack+mod+apk+original PDF link annotation
    • https://bulendengin.com/upload/ckfinder/files/78898971706.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131433655e5d---18398672198.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/12883530196.pdfIn PDF document text
    • https://ubranni.com/uploader/files/63055743096.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nojujudesadamikobedowe.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/gofomudajolesane.pdfIn PDF document text
    • https://mbbs.hr/files/mazadopinotejonitanine.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/mudilikujifomiruwanovular.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/92192876849.pdfIn PDF document text
    • https://mahae.hu/files/files/mamefef.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccc9ec56d---boxumuzilo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/nedebuxuzin.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371f095e1c6---31548118018.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67629115564.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/81726494302.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5a4f16578f9e5a4efe93cd06d33c33f0/wonebamuribumipimobobusa.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/kibibijaboguloserujise.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/84329004978.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/xabizem.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/bifumefufug.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/52592481014.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/14019762783.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_115010.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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 10892 bytes
SHA-256: a0c0b8dc91809b389d0046a32b89cecccff60e877fe66f7cdf7960bda15de369
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 19256 bytes
SHA-256: d9aa691a931099bdef2287d871eb8a5d0285cc90d7fe45e18c6082fbc0dd799b