Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c759ca51650267…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 12:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0df3e88951c6e9136a7b466ef0cf1d8f SHA-1: 81f70efc3b3f4627916096adf1d6f8689c9f64f4 SHA-256: 68c759ca51650267cbf97dff5e80d24bad9aa801edc06f96c8fe531669d68192
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=cam+viewer+android PDF link annotation
    • http://madurastones.com/userfiles/file/80041153144.pdfIn PDF document text
    • http://mfcpavpos.ru/file/pavapotisezitid.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5ac767673027fba748660a8073929683/36497117687.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sepaxe.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906134409.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/vagomugereguzigo.pdfIn PDF document text
    • http://naviway.su/upload/files/95174629779.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h9umnempaktei8oj1oun0tm7de/73147586990.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/17414629135.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/19711364374.pdfIn PDF document text
    • https://airbays.com/userfiles/file/35034247112.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/pavos.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570f3c268---wigelaxijubiviket.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/93091453194.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/50423340758.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/tewugeve.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9f8bd5ac---jujuvifavupubiv.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/jufojupuzoguduwexozafaker.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/22150798650.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/lajasorepiporufe.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/21914068399.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/95466584246.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fobd92mnl8h8ehhm32k24660r6/24674907625.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efed77e700---52242422526.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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 10280 bytes
SHA-256: 08a13532df4c8d20694be6ce70a58365e942e9764f5bac3156de4d1f702a997e
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 18844 bytes
SHA-256: 1fb909541baf125dac6063217e3d8f3603204598621bc7a80c63f80542732b46
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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