Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac75a6f5e86fde1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 16:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e0b6b404ab7998ef8e296e17de8e554 SHA-1: c4a63c35a9a3f7a203d8cca2e7783c81d37129b5 SHA-256: 1ac75a6f5e86fde1d56fc1eb8697589bc92c867d0f2cf7d46605531cce5b3437
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be redirecting users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://seedomoretravel.com/files/files/fosiboga.pdf In PDF document text
    • http://mkbeauty.vn/luutru/files/farejoro.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-21/20210921120303686153.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/53455413454.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/reduvegelejifinijaku.pdfIn PDF document text
    • https://thietbigas.net/media/files/40840768893.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/fovexuxiwod.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76d27e2fa---71829609847.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/62454207623.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/85765808081.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/mo15bbfbg62cpq5ndiiuqj1tft/nilikavevazavalurudanap.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210902133342.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210923210817_NDkyOTgxOTQ1Njk=.pdfIn PDF document text
    • http://faradbox.pl/files/file/tozemuruxozonadebid.pdfIn PDF document text
    • https://kimansion.com/uploads/file/99528202186.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c2c63412eda545203b8dc9d359a3cbb5/zepaw.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/tevuf.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/23674215502.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/15803430096.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16148a57b6dfa0---kaxuvunejazesawiva.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/38783317580.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/26822451536.pdfIn PDF document text
    • http://honghuibio.com/d/files/bawizolabuxumiduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+factory+reset+mi+phonePDF 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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 10892 bytes
SHA-256: fc2eea54bb4d9f43e27aa7e596c7ff72b56c1e4c88aca271d40c6f0d4fb94491
font_01_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 14740 bytes
SHA-256: b989948c247be8774b6daadaf13e395e1169b1685117fa1ed47e03d0a860fde4
font_02_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1