Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e36cb72144e57d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 13:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c46ec8bd104e39482c21c592ce23e13 SHA-1: e4250c51d0761722a5eeef87b4ea88cdbf8d7b5f SHA-256: 97e36cb72144e57d9485cfae58c99a0768457cdf3584c0b4a031cdc2be201ec6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4419b1a2---wuxuxobikosulitur.pdf In PDF document text
    • https://yingzhaoliuart.com/upload/file/gajisoted.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jorejuj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e1aa5e733ad753a644bb4d3bf94b91b4/sigepukuvozarusu.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/sibonusoxuraxuvawazutoba.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/duxawenupoduv.pdfIn PDF document text
    • http://flexa.cz/docs/file/93167173560.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/kokusanaradoga.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/lawixofew.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/06ab2501ae642b31c94fc690e1871871/tonulozudosisesa.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/koluludagip.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1ce80f4c8010e989e36113ca593995ed/livuvobigexunufiwavuzep.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce980612d---66577212558.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c400f5ef00---bejepido.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3d6041eea0c33499e0beae8ad7947bb9/fakewaroxolojugidosurilud.pdfIn PDF document text
    • http://waterreducer.cn/d/files/58106394638.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210723_4B76C2F9C65DBE41.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/medaluratuxaxalam.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe6373fac---xitosewofelififekowi.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/bazuvogixilasa.pdfIn PDF document text
    • http://www.agot.pl/upload/file/rerinafazisil.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xulovonitululig.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/46578780383.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jixagamugavudaw.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0rojhenbbfl8iq64guafn3qog7/mefilukuneveloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=frigidaire+induction+range+manualPDF 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_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 10624 bytes
SHA-256: 1c5226c664e50909279a5fa85a8a7132f81bdeaedf8009a10c6a7af5829733b4
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 18268 bytes
SHA-256: c861fc044b2623bbd007ce4fafcfad44ffeda4618ff3c7bd455b597feeb5968f
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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