Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ccf2e391395163…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 23:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ecdf2a12dda7facb8b5ae700335692a5 SHA-1: 359f5c1058950c8d31e9d417ee41cb9f9d9503ba SHA-256: 89ccf2e39139516376368743afa54b96a8df90db9ef58247b891e14c14c43332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to external malicious sites. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=timber+floor+section+detail PDF link annotation
    • https://youxsoft.com/uploads/files/6559806571.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/59009498103.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/830574624.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/nipomiton.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/redaje.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70b9d9d69---4858814780.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/sulovoboxojawin.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/subodinakerinokitejob.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460e511d9b1---34180846544.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/l3umrt2ikn8e8chidb064r2nkt/39501900601.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/30350151859.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xobakagovelobo.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/zijubi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zufomi.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/lolosapifupijimimaj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/36823784837.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/sedewiboxujo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/12471376847.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/84377515220.pdfIn PDF document text
    • http://4darchitecture.org/img/all/2604949443.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477df57d446---62113865645.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vosibotunetiwikibe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fb05b401c---gefabinalab.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090815323637.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/danamewumoxupavi.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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 10740 bytes
SHA-256: 1a691c6b93837e58ea2a32d9c66114d6ec378f3742ebf24b45b7b9cec0b68a77
font_01_sfnt_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 14356 bytes
SHA-256: b24b7cc162775da8bad06b96836c74b155b119967e6e4ade3609318234d24ff4