Malicious PDF — malware analysis report

Static analysis result for SHA-256 5923096a56e6c5e3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 00:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47d6ba2be9a0c2910a08262c280d4ddf SHA-1: 7759a67045fa0b3c0fc07753dd77fc861c3c4f1c SHA-256: 5923096a56e6c5e3c27ac3570ba5e6d1daaf1069460a0c3539358798787161b7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'download button' heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://srmhomes.com/images/bulk_images/files/nozadesujigetojem.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161302d204d777---46350097226.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/rewisogej.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/napumoda.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/refuvojizamugodidezutarif.pdf
    • https://bushregenerators.com/userfiles/files/57633990268.pdf
    • http://capthepcongtrinh.com/uploads/news/files/55528450279.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/gilurepemeremite.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/250c98a8c8f0e47bc5c2a05258ddfae9/kunafog.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ece8ce4739a0cc2b74dcede71e244e13/tojozisenenibikumulavezi.pdf
    • http://tcyy88.com/userfiles/file/2021090305263373499.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/tulomatabotomi.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riruwojuboxegawijada.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/39963255590.pdf
    • http://dxline.eu/userfiles/file/jiledoromami.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350ebd57d56---denujadutulejigoverevobe.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/63dko0kfuv1v50p416i7km8113/19445382103.pdf
    • https://holocaustresearch.pl/nowy/photo/file/varinavugobevoxujo.pdf
    • http://alltechsro.cz/files/38005918179.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f97ec2368---kasamaxuvajepe.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0b7dd3a0---xixetuxav.pdf
    • https://detectagsafety.com/ckfinder/userfiles/files/guloguk.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/83880097073.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/31195257966.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/vubusuvuripuvimewifi.pdf
    • http://portaldo.eu/contenuti/upload/file/lupuribanidirawosadorano.pdf
    • http://marcobernini.it/userfiles/files/bijifagesofibavebukono.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+mini+militia+pro+pack+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16792 bytes
font_01_sfnt_off0000f35f.bin
a1f58fc24285822fc572d79603b0bfb2bb0f4910085dd7c170b8433e17e836fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 17068 bytes
font_02_sfnt_off00011fa7.bin
767120139f85dbfcdecc4cd7a48a2e56b60f037557d355c512e885821997b315
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 10656 bytes