Malicious PDF — malware analysis report

Static analysis result for SHA-256 9368ed32376785c5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 11:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 418057002c78b69a8398e13fadb45f4a SHA-1: f767e5c6c3754812804d739ebce2cea234d4ad58 SHA-256: 9368ed32376785c585b7e2375eb20b51ec97021c1df31ea1f291ca5be1d531c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d587a2b74---temasulofisalowu.pdf In PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210918192146.pdfIn PDF document text
    • https://il-gusto.com/images/file/64775466821.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/ropovovenanol.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/48278364612.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/tokuvazanosu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144166cd6fe8---baponuvimevijikoxerife.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/10710687775.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/siviki.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/80113762020.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/76333516826.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/bofidaxasepixawudeluwe.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/pevaberekokexovugikoxe.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/nareze.pdfIn PDF document text
    • http://ndt-ultratech.com/files/52031269040.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/gubiriwil.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/dunuborotoz.pdfIn PDF document text
    • https://rajaunited.com/contents/files/tokajulazumaga.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/26616925705.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356bc0af275---4508585998.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/35806539308.pdfIn PDF document text
    • http://gewald.ru/content/Files/65282929634.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/vatopuzakawewunolosot.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/lelogetevetigunav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+app+project+documentationPDF 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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 18056 bytes
SHA-256: 306660c3b36060f3c52bcde63759f78c1b5a0309e617229fa09bdbfd256b9719
font_01_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 10672 bytes
SHA-256: 10471a4a166fcc6932944f83a0b77ac2804ce8311cf8818fde8e7ed4b181b879
font_02_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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