Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb712381dbc5490…

MALICIOUS

PDF

146.3 KB Created: 2021-06-25 16:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5ef739c6e8214609bbf8970e4e3da8d2 SHA-1: 69b1d2d69ceec1ab8826e1c6d2469ec9519c0165 SHA-256: ebb712381dbc5490b086a1736b9884a371da20c77f0224e7302b8432c4bf6215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV identified this as a phishing trojan, and the ML classifier strongly agreed. The embedded URLs suggest the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://luminex.pl/upload/file/46395083959.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/golul.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dff4d5e4---24711530621.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086acc78a5c8---vorekapenusofelewa.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/rawonapatininoboma.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5b094d9---goturojiliwojinakifeval.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b04ff5238c2ca317f39866996ee3394d/tobinibobomogigap.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75835729240.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e248491556f5ae051a2c5a42b11e78d1/39053540313.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/rifomimem.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/90012869668.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/74063216375.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/491a80a1f24f9925bbc2955d745bc408/95457621061.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6374d04---1619189549.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfcf36baa---80703084662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=homonyms+of+sellPDF 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_off0001db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB07 19464 bytes
SHA-256: b45b8216575e130a0912d634194fea2f26d207b0737d941b5a2e5bdcb9f5b9ce
font_01_sfnt_off00020de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000225fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225FD 10028 bytes
SHA-256: 91f8726c85211c7c0d3dc178008abd37b42b26bec294bb42a3fa3f5813166967