Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbefc1a2abb0968…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 03:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18aef9076f4385cedb4bc3885edd49dc SHA-1: 83572407077fc0f7bacd568702bea84c221d5206 SHA-256: 8cbefc1a2abb0968382402eb34b54b1a091bd44762cb620668c63166e8b17541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=forming+and+solving+equations+worksheet+tes PDF link annotation
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081819c48911---97817733675.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a867760e50d---34215285099.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15b35eff2---2970640006.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/degisatunejosixilikozirid.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3b9f37b00---51361477231.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/jibupoxikujimepilojeseg.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/61590806079.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/4461185597.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/21190271960.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/67853475851.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d6c48451d---wisugedegosininonez.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161030afc2e195---dizapetolivawom.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gatopadipele.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b40ccda8---zenanebesofudajinolikami.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/17179183461.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ds23vl04135vlib8q18p48vkl0/jonosuwilelaralolapinako.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/61421277640.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2uua7hu303vt9khns6052v0vbr/baxozasowuferuvezi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfffd337822---kegisifulemimenomiju.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/14697856650.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///21964777942.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/48504597793.pdfIn PDF document text
    • http://recviem.ru/img/upload/tafewuvapadur.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/54448158582.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/kidowedufitogefa.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_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 11160 bytes
SHA-256: bc700905956d14f5d644f170f92ddd7b978816ddd4c52dcffe808f2d7f2cf7e5
font_01_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 18000 bytes
SHA-256: 2b3d6bf5062fb71c8f8bf6c54d545dd8948a60c5b26148cc1ab7b6bfb3860992
font_02_sfnt_off000146ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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