Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32687971c289aec…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 21:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b41069dfdc0d3b1f66ff4955f50444de SHA-1: 993a1852cd5c33e2c454f35458d244f2083491f3 SHA-256: f32687971c289aece1804ac760abbfad8a6d3f5bdfa4785db8ed5080b9883a83
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this, as does the embedded URL pointing to a potentially compromised domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://jf-orvalho.pt/userfiles/file/loraragewexibanuxuk.pdf In PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jebogafirekabam.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/fegejukizakekavulu.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/tidazusofikosolizudu.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kotofexaferonunegex.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/gexofize.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/dizojeserepobesolexa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132db6860f01---96351574839.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/86873572413.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///15859717354.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16142ed1363c8e---xulafet.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/40433952324.pdfIn PDF document text
    • https://langumeistras.lt/i/File/jenawukaz.pdfIn PDF document text
    • https://ahha.az/userfiles/file/totufesajulunesowisusalo.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/jeborenoxuzewexaduj.pdfIn PDF document text
    • https://rosycaffe.com/file/57549734994.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143420606c2f---kijaj.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/23300727031.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c40e3907a---3811499521.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/dupok.pdfIn PDF document text
    • http://hadt.vn/upload/files/92467793978.pdfIn PDF document text
    • https://mavibusiness.it/file/67405527018.pdfIn PDF document text
    • http://wixoon.hu/upload/file/25957720938.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/xakibu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/66348563157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kotlin+calculator+codePDF 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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 18728 bytes
SHA-256: 5e3b7321b70c9566a0607a54482e5299fd62462b0b7b1f36913cfd143655ebb9
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 10288 bytes
SHA-256: 4bea12da16137797585b5e0e6dc185240907b2a1310d27f41294f1d04ef794e4

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