Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9db9a68f5f6d66c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 08:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3616c383167457d0e9e7cec278a7b23e SHA-1: 4936c322574138d372718e2471bcd190c1469da2 SHA-256: e9db9a68f5f6d66c7829adddd854bfa77ed2391375b01b6e6829dd28cda5ab98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://synerhu.ru/uplcv?utm_term=medical+physiology+book+pdf PDF link annotation
    • http://www.web-globus.de/ckfinder/userfiles/files/47213644435.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/79042051024.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/teseropuzamubozibumuvape.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/xosamafob.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109170306489097.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/48792054940.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/91166648573.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/88005430323.pdfIn PDF document text
    • https://kimcert.net/E/file/26739066595.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/fujivobijivujobolag.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/86543857263.pdfIn PDF document text
    • https://andana.us/files/files/77461452819.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148532fdf6f8---34224743654.pdfIn PDF document text
    • https://kermanrooz.com/img/files/lugetokili.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4ed5688b1174a0755ba312773b5e3600/78071320683.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/belabasuxuxoremo.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210914_034552.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/19746171921.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bexubivisoxij.pdfIn PDF document text
    • http://ndemal.com/publish/page/file/81259927671.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a09f846---84888262171.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/bujemaraguximotukopisere.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/lafaduf.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd81aa8e4---zosiniruferigujagetu.pdfIn PDF document text
    • 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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 16952 bytes
SHA-256: 5525ead9088b8035508aced8f4cc1bba64c416555bab84ef09eb10a4cdb45bf0
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 10936 bytes
SHA-256: c3f0bc42a6cc0a904d0a0d35c0e1b2f2d9efd207a8d2e7498e4149837cde047e
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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