Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1f4b960f882b6c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 17:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63f30640ef711623290eb2f1e11833d2 SHA-1: ac2bf5b60cac838e840f06e815206456012d9fc5 SHA-256: da1f4b960f882b6c6bbe466e96e33d12f4b3c2d7dea35370d77ac983f95560ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous external URIs, many of which point to PDF files hosted on compromised websites, suggesting a link farm designed to distribute further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=how+to+save+a+onenote+page+as+a+pdf PDF link annotation
    • https://beruanglucu.com/contents/files/vigebufodizogodesokajiju.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d8ca4948e65038ac8044ddc32c3e834/temejalakutesirusafa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161457c5f68a02---dukutitinekofoso.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/xobiki.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/32961087497.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/62695576532.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/tidutebupulakexidolevinuf.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/xukepita.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/22052420464.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631236246981e7e68ff425e519f3.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/4977970537.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kulavabupola.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/xibowuvavutazow.pdfIn PDF document text
    • https://terracell.pt/images/file/notulenamibavizi.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/96488787936.pdfIn PDF document text
    • http://boldogelet.hu/media/54864257452.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/bewojimaropu.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/tepibomixokixa.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zabezezegavimakemig.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/26396159857.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6qb5kg1caq781lffn31ron01sa/55149699352.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tojumanavaxifofekixo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/fenolofuvudas.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/tamupaze.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kijigepupoli.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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 17432 bytes
SHA-256: 4206cac3a707acda7992eb8e74eac66de879b250198c63666b5d29fa9d4b759a
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10576 bytes
SHA-256: e726729183b5760bfdff179da3fc77631c3a17904e013d93c74ba481984d04f0
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1