Malicious PDF — malware analysis report

Static analysis result for SHA-256 978d89fd147deeb2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 08:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9889e6404e24e9d7725cd3cea829132 SHA-1: 97b655d050ead74736162da8c84d9b152ad49db1 SHA-256: 978d89fd147deeb21c47e409d3b74d168c1e3ba0175b21db11ccb022b17208d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=six+thinking+hats+real+life+example PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1e294f0---jebevogeno.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/75325091117.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zuvat.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/40369949199.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/gefidakikinuxebenekerisa.pdfIn PDF document text
    • http://classtool.info/upload/files/rivam.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/89001268912.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kixezakupisukus.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/vevosexomifof.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/19540297434.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/96608287915.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/bodiripewaz.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365c9b8886---48021470795.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/95432620818.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/77778504016.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/zijamevibomupetaxemiz.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/51444732619.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/4806892017.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/47262273744.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/gasajedikaretigevoburisi.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/dovujiduvidusoririkeja.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136da8d5bfae---mikuramar.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/lejajezawagotaf.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/lokuxipapafelavixuwakakug.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_off0000bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 16640 bytes
SHA-256: 99f4b9db6903302ba463010a76edebf577a8754ce2fe7e70abd59f77b5f54c6f
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10956 bytes
SHA-256: af13897532193746e51436701edafece2444e343c5bd5389985c630b9cb148b2