Malicious PDF — malware analysis report

Static analysis result for SHA-256 eced57a24cf78973…

MALICIOUS

PDF

79.4 KB Created: 2021-08-05 19:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17850bfb79d0dd192fd193689bb64d04 SHA-1: 73d33b4e7e247da16b51e658833f479abbe79989 SHA-256: eced57a24cf78973b0925011961882095777835f785e23cf268fd9fbdccb4d31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through malicious links, likely falling under the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://stauarchitetti.eu/userfiles/files/16408468286.pdf In PDF document text
    • http://stihoplet.by/upload/editor/files/98079028013.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/70080834767.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/dajaximulukibisiraboxam.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/19146468102.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/tekevexajibon.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/57d11f47fad0764dea9ffba84983ee63/62025867907.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/putitugimogepipitag.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ddc8b406e0c474dc611809508c058817/896679333.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/83508137328.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tinanolosetujetegelot.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c08ce063fe235c36f822f3c1ddbf9af9/40926294379.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/20929105022.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2hscc3gtj9q9oja3tupitn8p73/razukisepef.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/mulukotopebaxi.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/64644919771.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/farunavisiwilut.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b040c9cfd8a---rafekovuvovidev.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/63965986667.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/29763011411.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/lorilujijomad.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/12f17c684fdc2f1a2dee96d7287e98d0/pagoteveze.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ftm74bn79nv5tu2ai5i2fenn74/tekagizakozilobuduxad.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/00e4f4b5225d246ddbfd336e26b4de99/74700701244.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/8504728253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=programa+escuela+sabatica+tercer+trimestre+2020+pdfPDF 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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 11340 bytes
SHA-256: b9949d645c93f99c0d2bc8c51163924f872e74b28ad9ba313a7629b111055808
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 18304 bytes
SHA-256: 82ebcb38cf720f053cd871274cc3b1e209e551e43f64fd9a834a3ac852951b3b
font_02_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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