Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f518ecfff162ea…

MALICIOUS

PDF

84.0 KB Created: 2021-08-21 08:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a49aaaaa870b690e3ead7f61569712b SHA-1: 978e143555391655247878a44235f4a6a72fedf8 SHA-256: 36f518ecfff162eaabaf57ce40b91df36d3b415b2f2d05bccb83d6a08fd61832
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of urgency lures further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://ukonlinedirect.com/userfiles/files/87145014009.pdf In PDF document text
    • http://toanthinh.vn/webroot/img/files/melasubatej.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021071708040273499.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/58bj5ufub7b0mo883gn3oki0kv/17142142178.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pawarozunifejupebe.pdfIn PDF document text
    • https://ivanamihic.com//files/16094770575.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/vesazizatipegidose.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kexusemewubujeronisad.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70968f6c0---26632903512.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/ginajebimidijexe.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210629_E21B4A8F9060E1CF.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/52daa74910f9d1d5b3b4f107c80c77b4/vurid.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210719_16723CC78735E748.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/jubage.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2afab8e7ab8cdf2c9718c2dff69ca0ae/29455748580.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16109649878f39---58819134829.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99794413148.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb8e059ab---ruxupivuvukopawewogapuw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0643c16a887bba48ce3136395975114a/zowudaluran.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/53b097952d19d329be0a1499e74ba39d/437687397.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a9fvi6j98eiuko8h4as8ro34bv/kurewa.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wadelo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4e7199c104ea38ef4706eb2197c3d752/73297949933.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/56384263860.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+ending+of+the+power+explainedPDF 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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 10760 bytes
SHA-256: 333e973feec478642c88756e890be22f9f437044631c143f4edbdc5dc338424e
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 16616 bytes
SHA-256: 17bc0a00b71e3994b76e261c101ceaa4dff067ad6deb34c2f5abfff0b1a3415a
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1