Malicious PDF — malware analysis report

Static analysis result for SHA-256 479b1bcca050dcdf…

MALICIOUS

PDF

89.6 KB Created: 2021-07-27 02:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de388da61072cd9d4fc440e512dc7504 SHA-1: 99ff3d00595df5ac22a9e30bd1e8b5b3c1f8bf4c SHA-256: 479b1bcca050dcdf362e738447e77bfc7255a072c5033dfc082805c51802423c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c609be9c628---41006350806.pdf In PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/27835766479.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c7827964f3a13b719d8c31464b21d53d/virosorisiza.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210727_D938565BA3EAA4E2.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/of8gmnr0ue899f2rab6f9693tr/31343279488.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/28410838967.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/ninetenake.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/daxowodosebuvegit.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/37531533062.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/deviwavobageru.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/boninijivuxexuxeretamurol.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/mexugebutiwiludunuxegux.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/nirizotopitisiwurebol.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/80489610799.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/joxofegatutizoxedu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/sevuvitufipudusoposemug.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4f6cce4dbd4912616357ff6a720f61af/70876641597.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/wepemesopulej.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xejakirurejasabix.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753603172ed---37630207616.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a1cdc539---woladelolebuwagupesoxufip.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1860ec35b5---66476898626.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f02c326c9afe43b473f1bc5e78a7a087/45200717206.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ncoafm0p0dl8ah5hks99fmpslf/54893967073.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/rokaz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5056aa4c23---84507049180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=que+significa+cuando+sue%C3%B1as+que+se+te+cae+un+dientePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/70494875708.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 17692 bytes
SHA-256: 212c0955b338515c3c86a293c9c2fa2c2fe3206698a2211239c10d34c9bd6bf9
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 11016 bytes
SHA-256: 148e73944f12426a1f399d605a2180e21638f85d175986f18acf8df25092899d
font_02_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1