Malicious PDF — malware analysis report

Static analysis result for SHA-256 25595d5e39cc4118…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 19:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52dd9c0f48304e89d0bb46a6c52193c9 SHA-1: c566ceac972105d2159301266c67a34c90dbaca1 SHA-256: 25595d5e39cc4118ffd15dc8a0199a7407e228b86859bdd8141666080eb784e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332c11abba5---sozedigolatatikoxe.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/5564874235.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/4452782066.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/21263352339.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b98aa795---67851486761.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139efa4cc17f---puvuka.pdfIn PDF document text
    • http://builderall.info/userfiles/file/rofokunomopaku.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613252de5e793---petubokavadugapitaxu.pdfIn PDF document text
    • https://kueapem.com/contents/files/jeseporunaxexejikukodi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/vevajofelokonepaloxed.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/fuvataze.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/rabikapiluwelinasonuveve.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/wonirawuxize.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631505518_4c66f389b9.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/27157244155.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/bimufuxafenuxivitu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab1e9dfaa---tomiditutalirulo.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/jelajuvimosiwawiwoge.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/17740552522.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/60398556134d285e0d93.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/95647992350.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/sesakatosenukenevirarebo.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/100243451122.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/736764357.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/74818216924.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/maduloveferuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=infinite+plane+simulator+apkPDF 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_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 10660 bytes
SHA-256: ade4381f444f8f8bdef03708e436a9bdde1814e9665652c9e9a6bdd418c62d60
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17284 bytes
SHA-256: d4a247eb5d6c1fe31720f541cad5dc86bd4b7628b87873549ff31d8cac7a232e
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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