Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f07dbfe2989165d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-15 12:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb3a3f1ade32fb992386f72aad2da3de SHA-1: 0a3c7313c4e2f1c6feb3f3eec30a21bd0c381423 SHA-256: 3f07dbfe2989165d429b205101ab55b696551a84611455575cb7db51a1774e19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate that the PDF acts as a link farm, directing users to compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cortocircuito.trialpanel.com/images/Upload/files/fizekijegato.pdf In PDF document text
    • https://tyko.pl/userfiles/file/96214567336.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/xivusajofulolor.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/880005525.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/84264831484.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/47086586737.pdfIn PDF document text
    • http://elitk.ru/_files/gazesilip.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e45a2f65---10983059260.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/62699164195.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/64812644797.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/04d5e1bccaa818a6fee2b4ecf211985a/kebasovebiwosoze.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141291ca4d17---32799360988.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/eee52d97d46957da5d18fe919be87828/63296449350.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/87481570470.pdfIn PDF document text
    • https://castel.ro/userfiles/file/pugaje.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/4863463585.pdfIn PDF document text
    • http://scsytech.com/upload/files/lexoladuwiroxivodugikum.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/kakuwisasawamatalezezumor.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/88731303890.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210907153440_2045638279.pdfIn PDF document text
    • http://staropolski.net/Upload/file/71861256212.pdfIn PDF document text
    • http://quranday.org/userfiles/file/66086870059.pdfIn PDF document text
    • http://japhina.com/upload/file/59682055983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tractor+game+2021PDF 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_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 17896 bytes
SHA-256: 5bafc52b0f14da86a990b4a89f4ba0bd6f37d2dcb68d9fe0a685abff28f89ce4
font_01_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 10420 bytes
SHA-256: 117b7631ceb75e52d1a4f535d13d47ed15178f9aec4ba145f18373e10c195396
font_02_sfnt_off00014ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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