Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bff609f2c9d4245…

MALICIOUS

PDF

92.1 KB Created: 2021-08-16 04:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3defc560b3a0b199af1e18671aec3e9 SHA-1: 7a4209f55f9f6234225da78986120a8f7d93b3d5 SHA-256: 2bff609f2c9d4245ccf4276891473c11328097e676d9f765bdf95700549d66bc
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing lure, potentially leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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 http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac918234d---59537480186.pdf In PDF document text
    • http://angelcabrera.com/FCKfiles/file/purininasudox.pdfIn PDF document text
    • https://amgaa.org/temp//files/bimegisado.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0831abf578---jidufekizopovod.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19bfb5bcd---43513266217.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hvchh77h4mfl3j6kco2pek199k/zetorezileleremez.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/273926883552801a543219e7dcc3ecfe/nuzebozu.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/koxawesamuvasezekuruvogaw.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/85791947064.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8omjbfj5fcnidv05kj3vj8882e/kotok.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/38587371837.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c41a21bca0---bomip.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/majupewomeba.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/2gcmjcjra5opft0qtio0urmupn/mimapewikole.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ffa35a6601a50e426199abc44f436253/9208933872.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e84c672f9ef2c6d0ba63547e0bc4fbe/pumivo.pdfIn PDF document text
    • http://gdfsztal.com//uploadfile/files/tibexuxatotevofituzidivuj.pdfIn PDF document text
    • https://mattress-leader.com/media/linojenoz.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e73692687e7---23306936350.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4spt1vhrbi2r0jrvqikug2m8qj/16175048510.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zelez.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/nukofezojuvogebizemezubab.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074259a99e81---napurazozezovejotewivawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+dark+mode+android+8PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17800 bytes
SHA-256: a68afa57df09aa738c9e498333e5d599dd729702d181a612ecca6b6626bf1601
font_02_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 10572 bytes
SHA-256: dfce8c6cd23f934ce8014cf54c2738a58026941b4d11cfa27b64eab839883a1a
font_03_sfnt_off00014abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABD 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878

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