Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b39cfd50d37b24…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 02:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 954a8e2b0e7511dd8cfa527033073f15 SHA-1: f7ca657c45496b9ca7bfcd5a0368a5fe54ef82c1 SHA-256: 26b39cfd50d37b2403f24af1b2160e7b88bed0af515bab218a912c7c8ea2c625
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://garglob.ru/uplcv?utm_term=pubg+download+apk+and+obb+file PDF link annotation
    • https://granitabrasive.ro/editor_up/zoxutupetat.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133648dd8b3c---57023287624.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/forowejefenetusugezulelo.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/75643009246.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210902134717.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/65383176638.pdfIn PDF document text
    • http://findusafranchise.com/files/files/79275709782.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/julej.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8000152d0---47254947663.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96089060d---zatasam.pdfIn PDF document text
    • http://th-hl.com///upload/files/43317436390.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bagipamofuxumubuvowa.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zorisafus.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75f8ab3c0---20317879218.pdfIn PDF document text
    • http://baoveantam.org/upload/files/93057692587.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/konukaf.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/lafakinebifejijolunub.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/vanejopefikejiwaxumapak.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8205cee3d---19510359640.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/75193668631.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/borirawixel.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/mibevifabuvosofepuna.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/memedab.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d7457f62---92297586239.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/labonaxijebokipulatusag.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/41994844358.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/takijuxuteginixiwozemi.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_off0000bc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC64 16100 bytes
SHA-256: acdee2f0748209d90343fd222b62e70e218029d5ca2565d720b3975f1bea22ea
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10724 bytes
SHA-256: 0f16479db0a40e9709731bb036abfb232f7cea701cf7cb9538cc9d9b2f6fd126
font_02_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1