Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a6b9a0c3e1d920…

MALICIOUS

PDF

79.2 KB Created: 2021-07-23 03:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 345cd47decb5b40bb087103bab3326d9 SHA-1: 4cd4258acbd826a73aa8d912877d832b4b8cfa72 SHA-256: 15a6b9a0c3e1d920622251c7e218a4090cc2c444d5a28f52bb36ceaed47a091a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are structured as a link farm to obscure their true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/502980361417a71a735d1b741d100b6d/72248542517.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/38d0777bdadc5b6132a8aaeebc3ea69e/75233438946.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/pawudizanumujugofasipemes.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/0e160e658d6a35e1d91e5bb8a02e8055/95528571932.pdf
    • https://ijtm.in/userfiles/file/ruwupixap.pdf
    • http://talleresjpg.es/img/file/gadulojedomu.pdf
    • https://west-holding.com/userfiles/file/kuburewixoxalusunogozoki.pdf
    • http://cosmikkino.ru/sadm_files/60601015227.pdf
    • https://mvservice.it/file/99541760116.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bc698660---8608014330.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fce46b8cb---bebimafat.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160982e41ca456---nidoza.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4e2d0f62a6f501cfcfc7d49cab5eeacd/nilupofimafax.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/aaeb70699d0da18b9efde5f076ef5243/lusupofuzezoberafime.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/nhienh6h6m8ut3kkit7hfegkv9/29086234029.pdf
    • http://jenan.com/ckfinder/userfiles/files/vetuzojeremijomupivexu.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2qrslgeihbibhnsdqigoc8uc3u/lebujopesuziwogupe.pdf
    • https://permargi.com/files/galeria/files/11632467650.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/xarewusomirukisazawilodu.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/4609dad02b369369106cb5cf20448c58/84295886733.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bdi4pgri21lrq0p2h40anla36m/81284963233.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/4331b5b422871235cf10aff9f4828bb1/pobafejamiletifavowigod.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1sue3m5lfv7pnagpe70nie0ve2/nikosilileruv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lyrics+thank+you+jesus+for+the+blood
    • 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_off0000cf66.bin
64885c49a26d2902e64fab68379a666ba88eee454d0e85d50522df1266be37fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 11104 bytes
font_01_sfnt_off0000e93a.bin
5367fef4a7691980ed033e11c2a8ebf3e83196e6950eecf2910d7a407cda31da
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 17156 bytes
font_02_sfnt_off000115de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes