Malicious PDF — malware analysis report

Static analysis result for SHA-256 72355361b7be368d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 00:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a17e682673393cea6733ddd766a6ba7a SHA-1: 55df20fcf7bea9758c1f82e2d29ef5eecb7e796b SHA-256: 72355361b7be368d14caec4b1d533621a46b5734bd80d5e7ed77c8e121566517
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and contains embedded JavaScript. The document's structure and numerous URLs suggest it functions as a link farm, directing users to potentially malicious websites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=the+picture+of+dorian+gray+level+4+pdf PDF link annotation
    • https://shoppingplanet.ro/ckfinder/userfiles/files/80179733920.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/93509474909.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/41815008095.pdfIn PDF document text
    • https://etadelloro.it/images/file/fovewu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffdfed6ce---getusukusezitufamidabapar.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/towopadokof.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/74005877013.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/kuwuguzijuju.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613078e5c400b---63590792542.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9f7dcc98c427c4970d187707606ce8d9/32077468506.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/75076253535.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/24280056909.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/vepedososalaxebuwogagogos.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/98279164514.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/konapemapera.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/6291537244.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/69107776789.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/75097604032.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/49972867230.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/sekep.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/turirujejonuj.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/67270662785.pdfIn PDF document text
    • http://theponghop.com/upload/files/61256720023.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/93639020793.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_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 11052 bytes
SHA-256: a58645f53e286c186badbbece06aa657d0cde5ff7d67a03a68bffcf7f7c04875
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 19988 bytes
SHA-256: 5eeedf5f99de73da1358094c44c0e9ab3aaf69f6474ebde53ad18cbae4f71389

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