Malicious PDF — malware analysis report

Static analysis result for SHA-256 38351490909180d4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 07:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 052a720a34f65477da2e43377f9a3151 SHA-1: c80ffdd7a24288222ad88d6bdb24bc4becc05ca2 SHA-256: 38351490909180d4a376592d74a5ad8aa72f950d4716dd1a3c5b637b578c8f3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute phishing lures or malware. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=pemasangan+bowplank+pdf PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/42507680908.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/linolodenawokasoxivefu.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/gimadukutoxelidebopudo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/pamajesatuga.pdfIn PDF document text
    • https://majubesar.info/contents//files/wikobefifezemelagis.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d826031b351bd28655727aabfb40b637/79703177131.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c02db317ae6---29485466630.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c76bb85---rugekadipodiwozibufodixas.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/82254271105.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/kudetulopurugazofugen.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/josodogasidozevi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7381757fe1---vijefaze.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/26049262112.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e13bba426---22036448407.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a264823aa---58644457947.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/sotevaxupinipedanubunutut.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7615e94e71---3919586939.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/92405754775.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nabawekosepenukadasarin.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237503ac1a---2471220079.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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 16436 bytes
SHA-256: 6ecc5dffc763562336ec4d3a17d022fb1e75f3221981d069615013122372b0f1
font_01_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10868 bytes
SHA-256: bbcabb89c7f345696eedb20fb519a88fef8f16ee09a5d6d8be3464b7875db5a9
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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