Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d8c28f69ae1020…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 08:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5854c02877246991c0eca0855eb95877 SHA-1: 282e7f840d63af7f79d419b42e0e688bb2e1d266 SHA-256: 57d8c28f69ae1020ee6959db895cb30a548f3fa836b3d0d750c1aa10e71f685f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=emulator+games+for+android PDF link annotation
    • http://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/wanijikefimagerofa.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e902f7ce8a51a22e2202705cf72df583/90353260875.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/88036902269.pdfIn PDF document text
    • http://hydrem.ru/images/file/dopubutu.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/28187638130.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/91564177561.pdfIn PDF document text
    • http://eventechsite.com/files/files/pupam.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cab65f76c---14016678176.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wowipefode.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2190fd28---95932201739.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3886fbc77e---monomomezelawabifa.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/91r2lv7kjmncrgt2giejallbq1/bozuxekadure.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/20305993212.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162762489982.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/30414183029.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587059571b---45737034123.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed34c41e8b---32294046047.pdfIn PDF document text
    • https://turbooto.vn/upload/files/mozajunafobuwo.pdfIn PDF document text
    • http://cy2hand.com/userfiles/kujiwajotizukaweraf.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/48094655073.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/87838791814.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/54716243244.pdfIn PDF document text
    • http://meta-min.com/files/vapijumazomeso.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/44482149851.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nnu3r4dv6dls8og19sugbott15/47522271116.pdfIn PDF document text
    • http://jarosi.hu/files/file/gasegawixojuxaga.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/346a0c18b4879d44e9db2460605d63c0/56374310785.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_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 17468 bytes
SHA-256: 5a8228273bb08dcc167c9c41d51d3b285adf048714ff0f27f1f78f0428bae43b
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 10780 bytes
SHA-256: befb1882851014cd527e04a83598291a996d860fee306d64c02e131e4d6f6a10

Open this report in the interactive analyzer, or submit your own file for analysis.