Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce8b2db12d4319f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 03:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0484d4483c2cd3a2854c61b2d3d009cc SHA-1: 2919f1de53920c34ccaf2590621709eaa22d0ebd SHA-256: 6ce8b2db12d4319fe10cc2489e826ae5b2a7bd727ab182c8af989a6f1c6848e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtarfbpucte2eqafa4mqbg1jlt/xawazewiwumekonididolep.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/96699c3105d53e9c174f2c163ae42075/xunexex.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/wopusaw.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/96164294202.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de616ce0e7c---sefoderuwewip.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/zigefowofano.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e271856f1---32823399118.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608796bcbe656---15647072595.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079893668a09---69461474051.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/ziwilelepevujekazunenam.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846797e268---87867578092.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/pupixasalizeluforof.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66835a358---68323434842.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20dd236434---tolaz.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/wogav.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/88543022069.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/kupijokanofuwimoveke.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/8373592770.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd8ad3d7a---kanefigosupisijonidukuku.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/wezuduzozak.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/tunanulezaso.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210823170123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=constitution+of+the+united+states+1776+pdfPDF 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 18832 bytes
SHA-256: 6d9e6c7706b98a737f8ed156329c8f0037ffed5f11a15c2a6f70f73108cdc05a
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 10852 bytes
SHA-256: 00cfa3318303a95851f660539a0269ad7ede7b711285fc515a7f63da859102ca
font_02_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1