Malicious PDF — malware analysis report

Static analysis result for SHA-256 316de6164c46fef7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 15:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b10be0d75406ec998cc99234e5ad78c2 SHA-1: 16b089ed64567e46f8804329bdccc22175019baa SHA-256: 316de6164c46fef7105ca1efba0601a22f0d25c13f008259a2861a379e23e4fc
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a lure for phishing or to download further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://exmar.it/foto_fck/file/75319814646.pdf In PDF document text
    • https://powerliteaac.com/userfiles/file/nidaxixibapeku.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac31972b6---49894521358.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/75338465761.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/vafopofawirejuzevom.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/vivewatowuruled.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/vanefepupizokowekuv.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6133c0ab0df91.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a11228d2---netumifimezevapil.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/kuputarepadimujig.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/2897735800.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lukelizogufubawulotel.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/fasiwedekebov.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ginokabijopejopavozodiw.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b06260eab---nifovofodivununevulavuse.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/63643490608.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/dazurexituf.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/gazikejidojutobur.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130364124d45---tadoxejixudolezikudato.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/34566234118.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3337efd47fb5ed41937fef1655b00712/83888577869.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/kukifuk.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/90561303761.pdfIn PDF document text
    • http://net-work.cz/data/file/lijaxejofi.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/22556669132.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/vejabelejuzowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=logan+lucky+yifyPDF 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_off0000b900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB900 17164 bytes
SHA-256: 7721857d06221f23821b58379ad5e2517e818e7a9213054439044b02f2e6bb53
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 10276 bytes
SHA-256: 0add7659c656ddebfbe583c7128590ef61d47facd4a62a81dea9a332080c225d
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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