Malicious PDF — malware analysis report

Static analysis result for SHA-256 554ff35c6b129abd…

MALICIOUS

PDF

84.9 KB Created: 2021-08-19 23:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5584f1ce9bba32c5cd4d6a66b4daa7a SHA-1: 746d8224b89bd0dd1df12ba49052c93ebafa1e4b SHA-256: 554ff35c6b129abddaa643bc64f570a2f930cee976fcf20fa21398317de5465f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The presence of external URI indicators and link farm heuristics strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=how+to+reset+vivint+smart+thermostat PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba7c7e2df---wolezijagubinifokekegi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c453c611032---67926046017.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/h9cko5fs8pipjuiku0a39pagc1/45318717575.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/dipop.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7892f6e8ed80e308c19bd3e9169377af/fenebozomogaxajewuge.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xadolepemu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bac52fd47ab08685dfa5dc8621b4f34/bananowo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e273da98---58354939011.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/97401181287.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/38627030400.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd88e3aeeb---mutasebedipefudin.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2002672c753bd5f334726914f6d5dcbc/54455193422.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae680b298---satexa.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c48ee9faca8c47cfd3bee83a4afb0e2f/ravase.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a9sdu2a2ent0u6thoeqnetocuo/64530239074.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/tifuwebuko.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/60979874728.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bab5c6e387c---6042800240.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12128594752.pdfIn PDF document text
    • https://kultmotor.hu/images/files/pawosutuvax.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815749c4c70---39525583394.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/67815644258.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160946ba5379dd---nadusojalowazoj.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/lagetifamapebisugakejeseb.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/nanobo.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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17084 bytes
SHA-256: dbc822a74c58ea7e39da77531f6f9a8d47198e883522c6c9fdcfbb73ab7929a4
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 10468 bytes
SHA-256: 443df8ac4e6cac3168c4cc6d65d706770a4b106cf92a7b332d35d24e880adc22
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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