Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9587a9a535ec49…

MALICIOUS

PDF

84.4 KB Created: 2021-07-10 04:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8aeefb9343b684becbbafdfb51fb633 SHA-1: 9c7485724f001f2471b84087a113931d2d9775b2 SHA-256: 4b9587a9a535ec494b7f71ba92bdef1c7d5f51786af5fb40ada23533383b7d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609588a09cac3---10911003571.pdf
    • https://lawina-radom.pl/files/file/terutanetefadesaze.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ebcfa63aa---63757523929.pdf
    • https://cissud.it/uploads/ck_editor/files/23646591939.pdf
    • https://clinicscrm.com/img/files/wexorodugu.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/8020850647.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c645a07---bukarizanikitesewasafem.pdf
    • https://acrgroup.nl/userfiles/file/42479012029.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf5a7a29a---bosaxakux.pdf
    • http://asbufestival.com/uploads/FCK_files/file/nepasevidoluvimol.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db673e3bc---83219590061.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/34hoen590pvn0lhcb55lrpavi0/mularujijegisojafasane.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/4072780186.pdf
    • http://stonestudio.pl/files/upload/file/60658278827.pdf
    • http://namjapizza.com/app/webroot/files/65459529712.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/73f8f1ce96527fac4c67009228af8e1d/dunidi.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73a22f71e---78092173045.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7487daf016---8237048772.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af65bde91---17068964938.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9sb0m0k9fujdjgcqr65pv46ond/bijasefiguz.pdf
    • http://aaz.sk/editor_uploads/files/25887629907.pdf
    • http://ajarnveerapong.com/UserFiles/file/nuxidowepu.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080445627c66---zowumewogaxezo.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/favibozenefinijowomeli.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cde7869e430db674a203e9ea87c1c1ce/buzejetakemokupomew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=journal+of+ethnopharmacology+pdf
    • 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_off0000e566.bin
be062a4e45b3b511cddda1e92cd3fb185d5e1d0bed948341dd3a2506eb795237
pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 17300 bytes
font_01_sfnt_off00011301.bin
a5b52f1e601a588aae9608044910e564a21c9d5bb998b2f8e1709309ae7c6222
pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 11012 bytes
font_02_sfnt_off00012c45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16792 bytes