Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b48f921dff15a5…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 04:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9aec71c816eb50c43d74900ddaedbc74 SHA-1: ca6c2d6b5a7f90fd3c89de3dcc77d37a3b121aca SHA-256: 16b48f921dff15a565ecf5e3da03eb9ef363f894d701a947f696043d4bae0f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://irlanc.ru/uplcv?utm_term=gtv+live+streaming+online PDF link annotation
    • http://asustainable.com/global/file/81972466746.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/patewoxedijuli.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/lunerezitubazozil.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/savezuwuropejaxen.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/74570485701.pdfIn PDF document text
    • http://gw114.eastman-intl.com/userfiles/file/85451950749.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae8eb56d4---jujazolekuvofef.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94120dc58---73385040259.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bipuzapenapozit.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/3353712435.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/jelakem.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/vizaxitazagof.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f164b6dbe7e8950d2d7a9be333bcb9a7/vabesurub.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614b92457c3cd.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/gotadogurasirit.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/30334563998.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/59029816806.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73623716142.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/jogad.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad183a202c---ridafanagusodubolumatigut.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19258222724.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_off0000b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 14532 bytes
SHA-256: 7fc070714fa0679459d548e755117f403b59bc6d0f480c3c27ed3d176e90a9ae
font_01_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10556 bytes
SHA-256: 6ccacb62e11f67497481d1a7e30e0901afdc57811d54f8dac8db9613224c0ffb
font_02_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1