Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373a59b0ce2d691…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec9e9594b4fe5e10c7d157760d6c3802 SHA-1: bfc5b2de8ad5155723f2603c5ec1c00cbb1f0b1c SHA-256: f373a59b0ce2d691a8c9e716577bf5586929ef5c8d235a85cc63e4e169015c41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a large number of external URIs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://crewmak.ru/uplcv?utm_term=graphs+of+chemical+kinetics
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c4094853---59814971135.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608793e1aa730---vamidu.pdf
    • http://erdivigado.hu/userkepek/file/pubosasut.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/u08f80k6vt4inv876mbvo6uie5/56664433765.pdf
    • http://alexlunacoach.com/img/editor/file/vijefemi.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adfae42a4d8---12328689527.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da05414998---dafetupegibubetoxo.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c37db2639ab---67814652269.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2fbebd6d---mibusadolovobavofezimopu.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210628050652291153wg098j.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e8105364---mofosozijemubegukeni.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sbmpuvfr805rdvlur11lnkr75c/wilisoxawefowizejub.pdf
    • http://arabic.cz/ckfinder/userfiles/files/59860897577.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b4cabfe5946139430a4faaa61ef579e4/38702807908.pdf
    • http://tanriovermensucat.com/uploads/genel/files/toraregiwisoxipiz.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/aeb2bd8d3ead13ea8318e1f7486cb628/tebalawimalagaduza.pdf
    • http://sequoia60.com/clients/875776/File/98484897147.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1c2daa2abb64e5454d633d011e21194c/41569636987.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b29546080---86970229796.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/q4csvun3g212u57ob3rshvrf2l/9728750079.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2ba2baf2ac485f765e3ed59fa64148b3/nejogopasi.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/22f1cd40a6b9816ab1e41feb12731b71/54863324791.pdf
    • http://teaneckhs1977.com/clients/67867/File/ruxoreseridokijune.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d0944201---nawojomuzikoweredatigif.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9aa64a79f---devuxomisigajamogunuse.pdf
    • http://pastoret.it/userfiles/files/lunofijonobupofemegama.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec5.bin
a6de707e4fb156476999c1fd99e9684c03a209f2b39f09abd1afa1dbd00f1b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 17416 bytes
font_01_sfnt_off00011cd6.bin
141b3c0459c9f5543b8d5d19131c0d4762a34b86b6c05ab4a8d72ec8eea152aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 10876 bytes
font_02_sfnt_off000135d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 16792 bytes

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