Malicious PDF — malware analysis report

Static analysis result for SHA-256 795e02d7b578f2a1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 22:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff68aaa76c7c82cee4d3017687f6ee9e SHA-1: 331d2958b1dfc35f80b797aff4d8751d5e2b16ab SHA-256: 795e02d7b578f2a13b2d24f40d73c6f30690af0f5331a51ced2638493a285615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that appear to be disguised as download links for software, such as 'download terraria latest version apk'. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nissanotogovap.vn/uploads/images/files/delejobujipoguxa.pdf
    • http://enkepharma.com/upload/files/fixeje.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/ritabonivogidos.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/43518617699.pdf
    • https://wemservice.com/ckfinder/userfiles/files/wefedugepakaginepajagetem.pdf
    • http://ctm.it/userfiles/file/54935075939.pdf
    • https://matfreklam.com/calisma2/files/uploads/28989408826.pdf
    • https://matrainagycsalados.hu/userfiles/file/tugedudojuputugefif.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0e9d88824a272ffe1b9653b61342b7e3/dazosa.pdf
    • http://pobierzplik.pl/uploads/files/46744459421.pdf
    • http://wellfoto.cz/pictures/files/demumavam.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/45704691178.pdf
    • https://kimcert.org/E/file/mipudokozizudibixulonomi.pdf
    • http://alvitraders.com/files/xuvezobulinavodo.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcb3ca411---64014044399.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/razizabosi.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614494a466653---mosejenamovet.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/81244298067.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/jumuxokekudaxusededav.pdf
    • http://strategie-online.net/catalogue_dynamique/file/55367653112.pdf
    • http://lukasikgroup.pl/Image/files/vobage.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/71077197178.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+terraria+latest+version+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 16792 bytes
font_01_sfnt_off0000f3a0.bin
6ef747894715643d393533704c465132fed4a7fa37fb52da0efbdba8b8cf5248
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 17196 bytes
font_02_sfnt_off00012065.bin
bc5d6b08a0bdb2d8af4ddc57d153515b1edc771c0de9bd843fb50fa9ac92f107
pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 10628 bytes