Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb377aa6874ee100…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 00:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64abb9cd2652832b2d61c1e2128ea280 SHA-1: e88e8eeed13e7f5cb4ff1a9e1db4d929d245a8ea SHA-256: fb377aa6874ee100feea28222f1cebeab77583711ae53e2551ba8738b72b6220
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also functions as a link farm, directing users to various URLs that host further PDF files, suggesting a multi-stage download or redirection process. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=demeyer+neurologic+examination+pdf+free+download PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tfiqsv6tgtf3bdu6gehcun3ep7/66843878904.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/13b5dbff1185906b87d1e6d24b17b062/fazemipudofanurox.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/47431317950.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/zulikelitosojewawevom.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d757bed0dbb1dfe33766c896ff3839c2/bosafotabu.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/xipevepure.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/vurusiworivazu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/goteb.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7539453778d2ba7bb1398f2aaa9bb41e/59046261839.pdfIn PDF document text
    • http://yuli-china.ru/d/files/665731384.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc519b77f---50280228020.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4nicr4trqrbcmhe4ekomudg8k1/90180600023.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/514e6f92d91224346dab15986a108b77/zoxebun.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/66036222726.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/kagusufagowixid.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/10396597691.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/75572714593.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/37751218131.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/gukuxajazavakimomame.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lugirosis.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/00b57536838eb6986fe641fd5970cacc/27101304803.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/xilovu.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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 11196 bytes
SHA-256: bb50ff7d081b467d15712e71aadce445715a94060d474d6e9a50380d78ff907a
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 17304 bytes
SHA-256: 1c358b3b0262eae6388057cd3b247091d048ff03e98e6ec2c7403f39c227e622
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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