Malicious PDF — malware analysis report

Static analysis result for SHA-256 19298226e76c32e9…

MALICIOUS

PDF

81.4 KB Created: 2021-10-06 11:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ce501cabf6ae1036dec79aedc9540a9 SHA-1: 3db61392a55dd3c97fa59efc39deafbae5565bc6 SHA-256: 19298226e76c32e990acb215b457ef9547533265b3bd4f60c9cc6c833116cd16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://vietsonplastic.com/uploads/userfiles/file/talizogoralofaxidos.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/6778677138.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/79143507750.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/rapiv.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/jadomuzajanoz.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/26074049921.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/27225852012.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/gekemo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/31100994674.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/ruferibopomiget.pdfIn PDF document text
    • http://potya.com/13758081129.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/53506291770.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/felimuge.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/vutugugibaj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5365d4504---59674065580.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dolabusidele.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538a4a34c45---70074926424.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/66400991886.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d4429d0b86f451d0d279737688d0080a/gegifibomenoxo.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/jorefukejowa.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/80681866610.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/vigasonuxizomazuse.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614677cf315d9---77669102207.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/zuxenomofedolunab.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156f8092e660---wezubuwevoxenasesak.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/bemidewezexigunojonabigas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=h+words+to+describe+someone+positivelyPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16692 bytes
SHA-256: 9661d03391c2260114c0a104339b2f6ff56d4cf7f059ef0bded9cb97d8d4b6f6
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10908 bytes
SHA-256: 5c37a39b67b295d602235013eb9f9bd5b8fdd2236fb367df90c7d962eeff176b