Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f727c05cc47642f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 20:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf4dae5f815207357e4b592ac712e3a3 SHA-1: 36e17bf8b6d6ce88cd00a365c5df708adcaf1a52 SHA-256: 9f727c05cc47642f3ce4529aa9a1cbef6b14182ae9c5e22f162e8a1248ca3169
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and presents a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The primary IOCs are the URLs hosted on these compromised sites, which likely serve as landing pages for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lhmd4152oojao9ehorrn2c233l/58636900147.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3ebe2a080ef064cf869203b4b28dfbad/xubukumumorigawemamux.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/ketaxepavelatawakuvorifuf.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/76867090425.pdfIn PDF document text
    • http://philipsphotographystudio.com/tusiru.pdfIn PDF document text
    • https://adikmanis.com/contents/files/pexijopogawuwuzavitupifem.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1f09efce---7182297573.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/nular.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/moromujuw.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/maxinufigemijaj.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/77288662324.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/sosegexupesuzerobanap.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/negojugujazem.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/ralugonadurupekevepuvizeg.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7df821e7---bulazisevimik.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3cd3b36f2---82286493464.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ae1200ea---wutamanakolivefati.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/96956513218.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/59682394361.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9a8bcfb6074385582be150b7f45866a8/75992165002.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86085459404.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/sudidogogevasekolem.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/raxajiro.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/tewonaj.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/31439125467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=4d+live+wallpaper+mod+apkPDF 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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10408 bytes
SHA-256: 1240efd4d0c8fe2de8db05382ee8fedfbdaf8209928c039c83aeb09a567f667c
font_01_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 17992 bytes
SHA-256: 2b7bece1ddffa0cf4ab441952227cc5762f87bd49d1c56d85a09382048f2a3b9
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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