Malicious PDF — malware analysis report

Static analysis result for SHA-256 128c9ff75fd5fe1e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 00:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ccdeaed830f2ca47bf834a3bed005ef SHA-1: a2b4532ad373669b18a0a41fc0778593af578ab8 SHA-256: 128c9ff75fd5fe1e980bd132702b84eb94bd7dfc067f912f063ce5ad88d246d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to potentially compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5ee7fa552caf0c19af09fad5b2e96808/kesipena.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa423003d47---34133878764.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee055a515fe---tasutifilafuxudabak.pdfIn PDF document text
    • https://somogyplusz.hu/files/41483628837.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c195d280be8892553331ca7ff2a56eac/kurufi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kosejokoxulemebosigupomu.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/36421430651.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/fefamoge.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1c8feffbf48fd99b5cfe9a4f53f4eb96/viligenowar.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/wixaza.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/lunutedupobeku.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/19113115741.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565e23fac---58764792053.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/josuwuwor.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215141322331516.pdfIn PDF document text
    • http://coumert.com/images/file/wemifeviwokokuruvezokesun.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/nojuwopekirizilidumezojeg.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/kuparo.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/valibekuko.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/95299915584.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba72a2863760db190720368725e851a/25455500971.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2b57fd5c1e6dc9aee8cc9041d243ccc5/paluralinukojedagipimesew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=coraline+libro+pdf+descargar+gratisPDF 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_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 10968 bytes
SHA-256: 4a8be271e936afe37914dece80cad62989875f9997d062b0680b677c41138984
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 19140 bytes
SHA-256: bc459b033427fa39b431d89763bf1bb7f4303482d90c03786a7608b225270ad0
font_02_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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