Malicious PDF — malware analysis report

Static analysis result for SHA-256 821edfca80027708…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 17:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 208a9eaeaf936921e653aaaa6da94cf4 SHA-1: 593dc783049569a61f2319743726b412958d5551 SHA-256: 821edfca8002770871f49d2ebdbb0968bc96733fc8e0bfc08bcb16d6a359cda7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7145

Heuristics 5

  • 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
  • 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://studioingegneramato.com/userfiles/files/75255379210.pdf In PDF document text
    • http://tianlanip.com/filespath/files/20210903065553.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905000313.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/39110814117.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/5847435215.pdfIn PDF document text
    • https://jin-ji.com/upload/files/29408603672.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/76352267801.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/15998433105.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/61323289718.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/69827986747.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/vonaxexe.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/63330881788.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c126649bc---76494539953.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/81446925300.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/85025593461.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kapexolabut.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48a52a53f68d4f5f6327bad17090f74f/liwuwe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/725a3b4314dc80192b8e1386c08ce936/36754966418.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/27695946402.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/47inc6b5m6arv3g88ej87muc5m/46196040171.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/34637446452.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/19162870095.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fa6629d---32677579224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+tactical+rpg+androidPDF link annotation
    • 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_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 18236 bytes
SHA-256: e30082123e2091b8436071c69c69a21e04090dd74bd1133682127424cb7ec5ac
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 10744 bytes
SHA-256: f961ec7ba3df63abf6797008ac395ca7acf549571f8cde2eca083ef475ec4318

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