Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d8f0a2ce9a5a5e…

MALICIOUS

PDF

94.3 KB Created: 2021-08-22 00:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb0bf78c3d023a0777f71d7e6e02f5e1 SHA-1: efd00dcdc948f6604e1dac8b752b529c6ef3b4d2 SHA-256: b7d8f0a2ce9a5a5ea41b33f9e06edae422819c5778e06af4baccaffdb58099bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://leebyunghun.org/new/upload/board/files/forola.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e04c904e1f9f24527065bfa2e0c74b4/najisoxozinagikadi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kcjjp4gi30erdvk5ovckn57g7t/gesopadeki.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cec4402a---ziluzarepurizosuwuxi.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/duledugusipifu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1be424b3d---81716172116.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863709706b1---98264011967.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4687abb97e---solukimaparo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/81984956292.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/vewabuzeva.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/vaxikituzazanowasudimox.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zexifiluzi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/66149316092.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161216b42353fb---vitezikomo.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/wulupedanilusaxaxediwe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1297a3d6---jezipadit.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/rajatovene.pdfIn PDF document text
    • http://akademibt.com/resimler/files/lariwekogikagukenaje.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mkiatpc298h713n726p22ode5h/mimofamapagirunodubo.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/68300651017.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/25689291705.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/13111262697.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/98667209276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=que+es+rudimentos+de+la+doctrina+de+cristoPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 18644 bytes
SHA-256: 95fd83b53881b630bd601cfc70709be0b0483fbf68f044600c5810d2eb441c77
font_01_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10692 bytes
SHA-256: 055dcbcd157f92533416903b976b06dd76f20853ceeaf4b1056df46e8d0d0716
font_02_sfnt_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 16336 bytes
SHA-256: 1853e256eb8029c4b9f150eee42204edff4acb16a0092aaf40306e80f77f0c9b
font_03_sfnt_off00015117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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