Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb3f62e479cd691…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 05:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2fdb84b37815db4a736ab4eb7e09410 SHA-1: 34b81df58889c434934b3217e21071d7a402739c SHA-256: ecb3f62e479cd691adf4bb73dd3267e3db6bdcb9a9ea79aaae31897e5d5b5286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting potentially harmful sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://funkyspa.net/ckfinder/userfiles/files/texadezexe.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161374d0bb06b2---darawononazizukodubafi.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/98554063544.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/49812803958.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/zivavadawukemolufudesiril.pdfIn PDF document text
    • http://htwy.com/upload/file/pemuw.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/61397946723.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/debazufasexif.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d322aed68---36801722120.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7140fe9d---befasubivofiko.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcc5180bf---futasamibofiputamab.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sonarezud.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/53487004330.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/linebiwurexifulewibumanu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/lasopopufebowo.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/52359419341.pdfIn PDF document text
    • http://generoussecurity.com/uploads/75902788810.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e2c245fd---gegebegel.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/95423940704.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/vuvuneg.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/62806898712.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/49054155679.pdfIn PDF document text
    • https://limsurempat.com/contents/files/70042516892.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/zurasatewuxitub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=maker+app+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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 18000 bytes
SHA-256: b3b67d2fce1e06b98f6bf5130263a627bdbcf1d6d2413ca2476c8b7d33deae8c
font_01_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 9704 bytes
SHA-256: 83c7beb60615d34b9f3dffd6a3fd33209556d0b7111490a5ee9fb6fa8f0414d8

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