Malicious PDF — malware analysis report

Static analysis result for SHA-256 320ddc5f72056f0e…

MALICIOUS

PDF

81.2 KB Created: 2021-10-10 14:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e231dc95dbb3f840fdef853427c7994e SHA-1: ec3678c14e9a9a3aee8451a625a05ccb7217b1a0 SHA-256: 320ddc5f72056f0e0fe72fc96c09fd4e5b9302fdae7558526afe0161ff714948
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=time+4th+dimension+explained PDF link annotation
    • http://needychild.org/ckfinder/userfiles/files/99689451398.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/76388461167.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/lojedakurepuwalupivujim.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/11910813202.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf795b460---nijerajudutanibexovu.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/70217937861.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/25689330708.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/90963470274.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/saxutus.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/66294776756.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/37317568613.pdfIn PDF document text
    • http://naso10.com/userData/board/file/dowufekogolikubizuvave.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/17828179241.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/bebubu.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/96450278985.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16158269c15344---69538699262.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/nekewewekirogefikevag.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a43abbc9f275057869c9ba7b9613ba3e/pegedegavokotib.pdfIn PDF document text
    • http://gzpropellers.com/uploadfile/files/5270038189.pdfIn PDF document text
    • https://metagrhyd.com/infopub/pub/file/39870181014.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/vodunamokofarag.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16155a51e65a2d---xiziloruguk.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/28281759084.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/17498103289.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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 19568 bytes
SHA-256: 46c39ef32288bec028b851058799335e7704f941d07db0a8e5f12617247a37f9
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 10700 bytes
SHA-256: 67541e97a8f36eb7a2c9791d2db6276d3810e5722153b85745baf9833ae26d9a

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