Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cce15951428e5c6…

MALICIOUS

PDF

82.8 KB Created: 2021-07-17 21:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7b551111781936f9683af5a90dcb7ce SHA-1: e1fc2cc3227fd73f8f4d44934f87eca274b080a0 SHA-256: 5cce15951428e5c6ab70b32025ca56a3dc99bbc0ecf65466b6f7fbe6b507b4c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF links to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa618f2020b---12548026796.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/20b9484e8ecd263ae15390e8a1151f11/10221827687.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc62d9bed---88856995249.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/91150865613.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ed31dbd5---85456209051.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/wafusekefutataruvonezo.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/podakilakewugenabituz.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1de4c146---zapepexites.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d9b806aa---19871830114.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1b3e0dcc18dd32c2e745c3b5f036fe07/10251716077.pdfIn PDF document text
    • http://unsersohn.ch/images/file/98230976739.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b01600c014b7467ec4db0634279fed45/pobuwurufi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b18c5855---zubeviminitoxiguzuximub.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zinekakaz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf5c3674c---59807861534.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb84b87d---dumililepaxejim.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/29k7cj9199foe75hh4v6ujdf41/9136506826.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b6cf333ae5453d54b9e4538646a66a11/66477423101.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/86320521889.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/73492989345.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5db9ab3d0---woxow.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/sanotevumitajamiki.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021561916174301.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/xufefaxinemonafexuladeje.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e9717846---51948295268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=asking+for+directions+exercises+pdfPDF 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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 10760 bytes
SHA-256: 0354e76d29937868a8b6c4399c29f1cda4a5cec8bf85d3b994d0943616fe498c
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 17552 bytes
SHA-256: 887ccf7b5526d191a48e2477cfaefe6bea701f21a71b57a12f11a679d01956c6
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1