Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81b5b2ebedabb0d…

MALICIOUS

PDF

90.7 KB Created: 2021-07-22 23:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb8a111ac11c76e0265f9cc5629181b2 SHA-1: f3aff838d72424af265ef9aa9a8c556f09810cd9 SHA-256: d81b5b2ebedabb0dae6a5293822a997f620480ec7fb26f3f0ff9b9af44a3f8b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078905823aa8---69641743672.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3e72727f---wavufoneladerafijoma.pdf
    • https://mariellatriolo.it/public/file/nunazapoguwo.pdf
    • https://tort-art.ru/userfiles/file/94199508562.pdf
    • http://foto-klub.dk/userfiles/file/34356505022.pdf
    • https://p99.tw/pro_pic/files/faviwes.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1brmthssskoi7c3dh9dqbhlck5/62864452087.pdf
    • http://cy2hand.com/userfiles/56841461488.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef18a63ce0---bugixavuw.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/22766504381.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/37428567380.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4le0fsr5aqi2cafn82d4t1g3pf/guxilivebizimirivub.pdf
    • http://rainbowcaterers.in/userfiles/file/5582075689.pdf
    • http://sendedianqi.com/upload_fck/file/2021-6-29/20210629105634178607.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xexegusafamevipikuva.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/45611696853.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8422155d25---vipajobebukirofawumujod.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160958fd571131---71674873145.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mlravqb3h0i5cc5v4am4v75sii/retadojowelu.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9062e04f3bfbdebbca0d5be3f0912091/12095837324.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b149b413---8647559053.pdf
    • http://villa-carlshorst.de/sites/default/files/file/89910716702.pdf
    • http://aihyang.com/userfiles/file/72810338566.pdf
    • http://mmt24.ru/files/file/ludepop.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/35b02215f118926ec2edd7917ba87c7a/39069533859.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de79d907068---bozimib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=demian+and+sinclair
    • 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_off00010190.bin
d7f98bcc3a7fc2a541c7bede89ddef87bda85da3e6afcb1fe1dc5a03cc475dcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 16700 bytes
font_01_sfnt_off00012d3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 16792 bytes
font_02_sfnt_off00014552.bin
4b5968012b27d53173f428551a27924e4488c60120ff042104270e2b23abb6b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14552 10312 bytes