Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e197c1478dd5261…

MALICIOUS

PDF

80.2 KB Created: 2021-06-30 22:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7ddb11206b4262778c56b938dab23b8 SHA-1: 587415dde556adc90eeff181faccf252c2159997 SHA-256: 8e197c1478dd526146e9c2f44304c6db979df961f7ad7cdd71ffd2678015485a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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 http://euhoca.com/js/ckfinder/userfiles/files/guzaxilogoguranixaved.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab9041923---71208395633.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b7271874---tukudiganotufilefad.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b22157d5---koponebave.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b985c0eac42---wuramofepilokivadusod.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m6s2hcttodvavff7c62aofqdl3/80846211047.pdf
    • http://bafiti.com/sklep/userfiles/file/mofepanad.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430021958516131.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/fovozaxodo.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c353a26c4---xixovezikevupalawepit.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gucsu5jfo402fm2f01bm9b1sfa/95423121631.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee8da1360---newofowamin.pdf
    • https://alnahamgroup.com/userfiles/file/fevakijuwotomamolimexowuz.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5530a33df0---45200799594.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/436a5c8e38211ba68515ed0faa6c7360/45735588704.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c9df2e4b9b2ab05b932334ff6421dc6/42659769464.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfa64cdb8---jisarudejojuxuf.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f4bed5e8604396e8ccde7d1e7c38eb99/34413593430.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/94447845559.pdf
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/numewefodidoroduxipuze.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/85635668293.pdf
    • https://stancijanegrin.com/UserFiles/files/1163745785.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048144b546---bumef.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g6t0d3qrtc2sm2hh64b2im2f55/xenaxufuvisefojajuwux.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be969124851---40877695195.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=find+the+volume+of+a+cone
    • 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_off0000d2be.bin
d6737156f95e579eb8f0cfb761312463578555f4173b41729f92b8a69b8546fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 18000 bytes
font_01_sfnt_off000101bd.bin
b6766739b58eaf6bf0c83a0cb460aa9487dfec6bfd6581f5cfb98d6b482de26a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 10616 bytes
font_02_sfnt_off000119c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 16792 bytes