Malicious PDF — malware analysis report

Static analysis result for SHA-256 afba3e88d795165a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 10:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef4b55cdccb04866a80352523cf4b45a SHA-1: 377e31e10cb92ce8d8dd6ae84aac849ea6c66826 SHA-256: afba3e88d795165a077671b41617f1cb60b2599c636bf57c2076340ef6fe0044
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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 https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/64fdafcd974a88ebc773d9f8b753dcfe/pikofuj.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/duvikirikedamu.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/25058082395.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/112bea3d4c0c6c9205f257a80b047272/15571229139.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609698ecd0c3f---71638600678.pdf
    • https://subarini.ro/mm/file/35392068764.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/s2ct5ttee4opv86fmknvfn9hq5/80702052738.pdf
    • http://allnatureint.com/userfiles/file/jilowezu.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1bddd85e7977d20230c0829bae8bcd84/nimuzededonodira.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-9/20210509123043274118.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d8ad8f7e07667c0f2349553f8bdcc485/fiwelixegexigasodibo.pdf
    • http://vasvaripalmuzeum.hu/upload/file/masinurunazoribusupa.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67bf1f5ea---xabaguxufesuxumupe.pdf
    • http://aisef.org/uploads/userfiles/file/file/gikizokobonilafu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/979gagrt5fu992h4sgcd35rgq2/sutiwaxo.pdf
    • http://envigest.cz/upload/file/litelagenomunuzaw.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bc3054f2b---13924521669.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be9131e4133---2666489414.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d05aa5041---67520728766.pdf
    • http://adabaskimerkezi.com/upload/file/kaxozofupamelaxesalip.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ef031a7a---movatujokitikimajoji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+best+story+porn
    • 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_off0000ec85.bin
6b139a4d283595c60dd70b2a76c0edd4f584a5b5927c5b4dd2b40ac1b6bb77a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 18056 bytes
font_01_sfnt_off00011bb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 16792 bytes
font_02_sfnt_off000133cc.bin
5dc29e2bff064f6d15f79ffde4552a70dedda7ed9ca972e9de392f318e9384f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 10264 bytes