Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b9a2ea71111c7e…

MALICIOUS

PDF

118.8 KB Created: 2021-07-29 20:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91d779fd852b49f7c70e93df17417600 SHA-1: 3de50de31eff4e7300ef65614f8782fc3da183b8 SHA-256: 02b9a2ea71111c7e7da5f0bbde3c9e2cdbf8d2ca823bbde01913def7d074bc8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ed0fe47b891fee8fb2e1ad2c4f945e5/48117530055.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102de87e0e9d---85029690222.pdf
    • http://jongauger.com/ckfinder/userfiles/files/kagowivirawawikinuwu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7285c2994---53957320656.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeca6d4375---sivawazizirotativemizufar.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/komoxoxabupavofoxo.pdf
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508073659393120.pdf
    • http://myhomeinparis.com/userfiles/files/nazubu.pdf
    • https://aravlicraft.com/cmsCart//upload/file/xekakubefetufejulovemofa.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec6fbee58bbf9279bb304424ef5f9d87/xudoki.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085490bb6ab1---fowipisu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ac814fb5---67238889929.pdf
    • https://manualismedicina.hu/fileok/file/1598534202.pdf
    • https://rmp-familienanzeigen.de/cms/files/watemobiwaf.pdf
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/56055165339.pdf
    • http://andrewsexes.org/clients/867461/File/93456719917.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1f9a269519b2b01eb1caf634978f0c02/gamigubu.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b740bd3e8e6---fubafe.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7694e9af---kavabukemixaxi.pdf
    • https://asiajitu.com/contents//files/19813586046.pdf
    • http://rlangkhan.com/upload/userfiles/files/68284520679.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0002a336a---fofusuwekem.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f589c204a---95527557154.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76496f705---69791930519.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160adcf0a658ff---35395534480.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a1d77331---sixuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=scholastic+success+with+reading+comprehension+grade+4+pdf
    • 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_off00016b81.bin
2cf81fd38929cbffae624be28ad1d8b6185639bd29efa2dac3df8b8e5651210e
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B81 17704 bytes
font_01_sfnt_off00019965.bin
1caab62ce0c4856a722dd5c44bd0a5318aa969d093e43d1869087fd819196417
pdf-font-stream PDF embedded font (sfnt) at offset 0x19965 11408 bytes
font_02_sfnt_off0001b407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B407 16792 bytes