Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0391b6de848df31…

MALICIOUS

PDF

99.8 KB Created: 2021-08-12 04:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bb8a6fe31ae3bea0c42738f27335523 SHA-1: fb79ccab062fb281256a01cd25ec29df719d44d0 SHA-256: f0391b6de848df3101626cfb41e7220ff0ef5771fc4977eab72b835f85aa6e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a significant portion pointing to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.hussco-steel.com/husscofiles/files/74375552865.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210722_E96762F1B414DE5A.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee7f73e16---botuvuside.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/fusarivamexonuvavedukeju.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/3102937737.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/norejamidaxuvikimawu.pdf
    • http://centrons.com/uploaded/file/86021950960f00ce90d670.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/96f036a8b9bb88ec28c78248793120fd/nebaxi.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/op56puoh73e9a55d8dunfmbhpv/nutimukanarazizefuxodufav.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b918602920deb6b1be20025f2e358c9b/nitulakadixererob.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d18ea3eaf5e---jajukunidisexosokapiz.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ec690b87af35e3267c0b6156fc221a15/pofowuninafuxemikivusa.pdf
    • http://feg.vn/uploads/files/57488451644.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceeee7c987---49757819050.pdf
    • https://zemiigori.com/uploads/file/sasemenokekuxokuxavej.pdf
    • http://huiking.cn/uploads/file/300035526743.pdf
    • http://pn-tech.net/userData/board/file/85467451478.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b83ea21c---43924737170.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lepj13qk9pjamimgibituqa7hv/55924712645.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/113c829fee23afccee1d06bedbe74b86/fiboje.pdf
    • http://itkaufmann.com/images/fckimages/file/tojedewigazowuzamikubijiz.pdf
    • https://clumba-indoor.ru/files/files/wupixepikugemumog.pdf
    • http://acecaalcoy.com/userfiles/file/tedumekijaguges.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u1mes54u2vb0an05c8pvodkt92/41216778977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hidamari+ga+kikoeru+scan+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63b.bin
a9eb3b9612dc552ca69682bae481fc6a9fa47a3b782bde5b83101a45f13c754c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 18004 bytes
font_01_sfnt_off00010f21.bin
65d9d2872655b104e5c280b779d693a1fd932f9a2517a2f14978fb00d0227073
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 3180 bytes
font_02_sfnt_off00011c43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 16792 bytes
font_03_sfnt_off0001345a.bin
663a2926d12293d36df77d13916a7d57d927088b6cbd36995c35c89900ecf2ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1345A 10904 bytes
font_04_sfnt_off00014d0b.bin
77298a8768f855dc9971776b2f619fc34743e99bef3a15e4ab9bb4d502a3276f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0B 19056 bytes