Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17cb5a04352aae1…

MALICIOUS

PDF

90.8 KB Created: 2021-09-10 23:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b02fccd37f1ae1cad29a8958f35513e SHA-1: a899545cace8aebc5ab9bbba17b22d86cc54a145 SHA-256: c17cb5a04352aae1ec1f354da0618600d2a6c5f85a8633c7ef49ff264ab60850
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://birutelorasin.com/contents/files/sulelove.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a79d82cb6b0ceb0f60b08514b0973323/miluwazusopusafixemixotin.pdfIn PDF document text
    • http://kaies.net/upfiles/210906161819514254xavgyf.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/98519382358.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/49116216374.pdfIn PDF document text
    • http://jucal.es/images/file/todidat.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c613d290---kexekolatasuvolijajabe.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/47185752768.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/mesaw.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210907164559.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/rejabaresatapoborexusa.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/wutufo.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/vodenikemefuriwivopijexu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/zufupex.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/23401737671.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/62724974027.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/dofanumo.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/48777225682.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae4e570fc---gejipukafuvumabusipenegab.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/16852065049.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/pudor.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba1203ef98dfccfccb01e48de98d739b/refedasamekegal.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ro1kb5uh0mnv11npq830fc9sfq/vafirozikujewubupiwefenag.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/pavajim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hack+app+data+appPDF 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
stream_003_off0000e4f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE4F8 17612 bytes
SHA-256: 4949d076e2786b45f9b060f41689d4b21f1281b663aad3b1d105f0465a3ec0b2
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 9828 bytes
SHA-256: 695254e291cae2c3d73ed3370c509e2406b840098da665a355dde76374bcd543
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 18576 bytes
SHA-256: 75ba0bb854e7e7775b7ec5548bd7180358b63a7836eac7a23214b443a4bcaf72

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