Malicious PDF — malware analysis report

Static analysis result for SHA-256 9090922732eaa564…

MALICIOUS

PDF

68.9 KB Created: 2021-09-05 00:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 835be3ab91396bdb2a3415ee026e002d SHA-1: a8bd5e699992b4b65c0500e843128bbf745af9d8 SHA-256: 9090922732eaa564d917323c305ea1a4f882711fe4402e67af3066f586360d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7b64c05b---53911134166.pdf In PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/6152531780.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/81781881524.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sagedakinisarenige.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/47staa8q1ajo7imf6addimjq5b/61127215265.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2m9heh90ialpeoqjg9st57cj00/76380910941.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd3d8915e---mavinirefurotujolaxon.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab99052af6---13811576747.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/83941167175.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/sewafet.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/paxegugedisitateragab.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070223123273499.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pujejusudeguzugususatonas.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210706_024008.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/49671998672.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5bd940b21bc2ecfd4d0756c98db71d47/xipotuxefepuderizuv.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/janux.pdfIn PDF document text
    • http://vning.net/filespath/files/20210904214248.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/10054367337.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/lupigokiwazuxeg.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9cada4ab---17771708678.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3053968d38ae07accc3552b5ae43fa0a/nuwitijolazogosudeliris.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/46770346510.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9bf0a830---98490383334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+quran+bangla+translation+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 11012 bytes
SHA-256: 81caf1bee7213a5e41d2a8d2e3a03f3e1d1e75dc89e1f68e4f4950183581dd24
font_01_sfnt_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 14088 bytes
SHA-256: 8312efae562c3629b7338f1940c717a535cea285af9ff56369831c9e38f431aa

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