Malicious PDF — malware analysis report

Static analysis result for SHA-256 36be4bc9a3e946c6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 14:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d9a7b3108f7ff218f3774ba36704c90 SHA-1: d03aea741fe9fc79b1a13c8a772ee630ecfc68a1 SHA-256: 36be4bc9a3e946c62610b7041e96d856e8c19145a315ebf70361f1d04ed09c89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting suggests an attempt to distribute further malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=convert+degrees+and+minutes+to+radians PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388af76c18d---7881439808.pdfIn PDF document text
    • http://cartopack.be/Images/file/wawanuxon.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/42902136265.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/40100753477.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/82868380411.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/zodulu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/jalewavifusabowebamabuz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8sb4n6fsro1rl2g0blgskfpkj3/bepijidivosiro.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tojexobate.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/67343591012.pdfIn PDF document text
    • http://synowka.pl/galeria/file/befojifakelusupaludajata.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d4776c2d---binapus.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/92718481526.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903000326.pdfIn PDF document text
    • http://jadeite.ru/images/file/19767104086.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/fipewubemetezekenomuzome.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/gomaxifelokozozubufuzeni.pdfIn PDF document text
    • http://ty-int.com/files/files/gikawonakokumulozapade.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gelavedebosixusatogipav.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/teguwavepuruvugomudejeti.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/67965826806.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/surivezipevojisijabelam.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10744 bytes
SHA-256: 5e7eae3775eeed41efd1affd15739f51a4bffd3194388f7d2d3317afead03899
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 18444 bytes
SHA-256: f2bf5efd4dd24796caa3195231e8feff02d584bd94b3f67c77085fa8b2ab9f8f
font_02_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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