Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1be7cc83e51320b…

MALICIOUS

PDF

82.8 KB Created: 2021-10-04 13:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a413734a4e61a7945be68fa0a12e9183 SHA-1: d92480264a5e87fbe72aac1f3d500efb534d4bae SHA-256: b1be7cc83e51320bc6cdf055578081419b47287a5609377b9b2b39851d238cb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=technology+use+for+education PDF link annotation
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/bapewobavexufuxibil.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/79286215196.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/58250766905.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0b70cc5d---gexemag.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919063203.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/31473698884.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca97e53ee---24068913710.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/pimemobufatigajira.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/zagaxoxemobezovozuji.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/40404266734.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/18132650649.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/57807072553.pdfIn PDF document text
    • https://cmoretv.com/userfiles/lafivenav.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/85467596648.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a477a90932---26602632962.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/22327433871.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///47551198370.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/86751728630.pdfIn PDF document text
    • http://artospace.com/pics/file/lagaj.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/vejevapuk.pdfIn PDF document text
    • http://saimiri.name/upload/file/793226156.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/lofeludolixut.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/064d1e7e79adaacb090491738cedc420/16484219414.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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 10932 bytes
SHA-256: da49b66eee6e9eea5ab2cd1ca6ae3f4557b210e51458fd36b2c6c01c13ee8a0a
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 18936 bytes
SHA-256: 193285eb195c4551e821d7842f3b75d51c8d9c5c61e5580fdc66c2e622289394

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