Malicious PDF — malware analysis report

Static analysis result for SHA-256 a457a9319a55d772…

MALICIOUS

PDF

56.7 KB Created: 2021-09-17 17:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0edf7851c9af7ee8219cb9fff978c1ab SHA-1: f7310562334a5afb4c0e8de4cae8e05c4802b38a SHA-256: a457a9319a55d772c111f5321d5eef126b20a78d40f7aeb75de9bb593a303781
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8159

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archism.ru/uplcv?utm_term=is+spinach+good+for+high+creatinine
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e906826894---12170692345.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413fce3ecfd---kolufexulifavisurir.pdf
    • https://gitedu.in/ckfinder/userfiles/files/bakudemalawoxala.pdf
    • http://parilka.by/var/upload/file/8124043437.pdf
    • http://bkm-market.net/userfiles/file/makitikiruroj.pdf
    • https://reniuved.it/file/93291781270.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/waredimutefolulef.pdf
    • https://ceccardolj.ro/userfiles/file/72319588937.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/vozoxibovarikusedun.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/35188236461.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e8cmepha1j2k3jmq3c1iequon3/xozomakog.pdf
    • http://chengzechem.com/upload/files/buvonovavukaxosuni.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142179ad80f4---wefagabez.pdf
    • https://pasarangroup1.com/contents/files/vaxekedapubodajanaf.pdf
    • http://caigeshi.com/uploadfile/file/2021091722465273499.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613280ea7b3ff---reranekenibonef.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210910_BA5A3DDD39F611D3.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/18074273905.pdf
    • https://siltri.com/fck_upload/file/28570253282.pdf
    • http://schokoladenbrunnen.de/idata/lomojarumemixoz.pdf
    • http://esangsok.com/upfile/files/92653158298.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-13/20210913181917172397.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/wutujixaxisawevidalal.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6d0.bin
ed0d34fc0430a391db089e0e1a19d9fe2b937cf427e076c838f22277106ce7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 15828 bytes

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