Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16b13626913680f…

MALICIOUS

PDF

81.3 KB Created: 2021-08-26 07:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 077a8c737c8b83e980736e5cd86fd1cb SHA-1: f6537f7c535ee21c2a0063852321dbf9017e00e8 SHA-256: e16b13626913680f7927875c001790cfeca56ad0208149a2ae2f4d53b7577e7d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://smidgel.ru/uplcv?utm_term=letter+b+art+projects PDF link annotation
    • http://yossy.biz/userfiles/file/31410566582.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/lalivulumenimerofiduwa.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/selevigikurugubu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/35617943608.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2461b8f61---17584416262.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/babamemimezafuvi.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/42317693147.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/lanidovojeg.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c63605bb---bipapanujatafabel.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/lazifedimemanulelo.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bd99b40eaaf877c0d4e47e0f10c34fcb/vidaxaral.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/lugesoso.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/rifemesitesometezawomasej.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e82af62855d---sazikoziziwumubodejejojuw.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/29132139663.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sekivose.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/95785287722.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4977d331c70bf90b990524533e3422bf/kagekuni.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/52690436023.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/97041510220.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/34d1b139fe13b1c736ce4bd4293a0ee9/paraxev.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e6de5f1cu4mak2nipl6cm5b4r/49707293619.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890abfaa7ab---vekid.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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16676 bytes
SHA-256: e1a7e512b5a4baffd84729543b2ef8405fca5d748d4853ba9e2c6847c650a121
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 10352 bytes
SHA-256: c54033d2900ef64b3fe70b6fdfb856bb43f4971d4c40cdc9715ecf0a5b15f9ea
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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