Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bc6d38605de396…

MALICIOUS

PDF

88.0 KB Created: 2021-07-19 01:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e55d57f4f61ce489fb8dd56d0a3cd54 SHA-1: 443b4988923598f1a1154bdb795aca84b298dfc2 SHA-256: 93bc6d38605de396e355dcc43df59407b78083ba1f992d4e851838d883c32f36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The embedded JavaScript is likely used to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://atut-biuro.com/uploaded/file/8575916621.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/zavozukenokigida.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/15428056400.pdfIn PDF document text
    • http://dakmet.pl/upload/gixefegakaf.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sulenoposaxagu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3f3c028b---lerawutetowinevilufokas.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/36632502541.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094aacbf3c52---baviziputofifubajaz.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/83254726509.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r7n30def0o23tpnd4lsjlh0osq/wopafalakarivudunakajaset.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/nuwerapuka.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/xeridebigatiwebidagujuz.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/47784791008.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/35429822635.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/wususususutotafek.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796ca4158f6---jilogelepagusafopulovir.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/97722826546.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/figidifalalasubemuju.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/71776153615.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609684d8043d0---34338074634.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vevavobiwumenujugobuwo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaba670d23---melodatakifebure.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160e218bdd34ed---pitumovotarugojepotazowo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/26d3b4e5c097ac9a02d777237802556b/zakejoxemolusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ccna+chapter+1PDF 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_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10128 bytes
SHA-256: 17ad89f1da15ad033807b43578bfeeba1e4b333622018742c98b1d2ae0120158
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 16828 bytes
SHA-256: 739ec0fb1f82b997cf1179736c7ae165891589ae1700f5d9792265be1fdba994
font_02_sfnt_off000139ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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