Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8426aadf5fa4abd…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 20:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8273bc7a7d2502440a2fe192c5b7351c SHA-1: dd61f6c06179ad1b4394c18d0b291c5d1db128f7 SHA-256: f8426aadf5fa4abd8a55cc6c178099ccbd92a358ec389153ead5b251f4a75448
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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 https://medvor.ru/uplcv?utm_term=cinema+hd+app+ios PDF link annotation
    • http://kiiga.ru/userfiles/file/joxinafelabuw.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130758210910---83214850391.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kivesiketuteto.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613753318a240---76878819404.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/selonipufoture.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/nonipotegaba.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/dejewoki.pdfIn PDF document text
    • http://szjg.hu/images/file/jasukota.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/10435010343.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/mifomukiwexarokisobomefu.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/75496968326.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909075110.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/fojesixos.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/67246304662.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c83e01ec7f5795fbf882a8f57dad888b/50084024797.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/64733610323.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/bowajisino.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuvirinajewafelijo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090316533673.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/14414305339.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/50691223863.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613904dd2aa5d---povep.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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 10444 bytes
SHA-256: 090d19c7bda0387b7ddd69b6b20a81ab55c11c11889a601a9c7e9a1da5034875
font_01_sfnt_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 16476 bytes
SHA-256: 1247b74af5c4a0487b22ded141dcd6b9ec7cb43c563359858dc61803d7224781