Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bef2c6e34ff8df…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 17:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54b5ab5526a6c3d300c324294cd8c24c SHA-1: b2f2bb39e8b9c2c51976c1e5df3b6bf9045286fb SHA-256: e8bef2c6e34ff8df9406e87946f79d51733c2375084322a958c4622f26a142a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised WordPress sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://christschoolblr.in/userfiles/file/subiji.pdf In PDF document text
    • http://thebrownbag.vn/upload/files/74327040215.pdfIn PDF document text
    • http://ministerium.pt/files/nobonolujubakovotozux.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/dodenimotimorameri.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/vilugit.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/52349378842.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/vitewekogog.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/gutigoj.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0b92ca53fd4919b5bec8527f7764251c/xipibajo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/38262277488.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/mesuwewijavizok.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/93984171598.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161479ca857cd1---satudaxawetalotatija.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/riwewozokexu.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/kosamatosugesetimun.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/kebiselimofaperibotepov.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8afea208---74154792474.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/88754346891.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82798277418.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/69796288625.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97b865890---65990891996.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/af11313b73f783170ccfa24d8643e3da/29381824928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+thrilling+games+for+androidPDF 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_off0000afe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 17348 bytes
SHA-256: 67c91d2bacdf74c39ec4bf907c22b85bc3f8e09a9236b2298998f6fefbc10717
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 10852 bytes
SHA-256: ba45410248c4d3a4aa9c529b9acf8c18a7f1c6561b020a87c30209a09c1ccca4

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