Malicious PDF — malware analysis report

Static analysis result for SHA-256 804592f890093390…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 22:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02c1163fbd431ee3737efc83bed5766d SHA-1: eb33b80f50dca8e0b5ab3587793a8721c0f31e59 SHA-256: 804592f890093390adbdefb7fa61a5f097fbc80bb36ad1c9b4f18dfcb9085c6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://akemi.ro/hirek/file/61963573874.pdf In PDF document text
    • http://suliaok.com/v15/Upload/file/202193354311090.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/mapagirub.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/58a5aab56c5c44994dd5576fa3f8acfe/16761706315.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/11587105843.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/68586627217.pdfIn PDF document text
    • https://777mto.info/contents/files/32289588960.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/16960551405.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/devadefogadasigetaso.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/17194734493.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/18229430060.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/xinadogukedaburamekogu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaae884317---73531485364.pdfIn PDF document text
    • http://hbaoge.com/upload/files/21007316221.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/76390827675.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/kapenena.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132936056640---makupunol.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/zolimok.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210904123058.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/20246421908.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/60833019842.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109052348526781.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zupefolegu.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/dopodaraluketeb.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/bixakazafu.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/24678010386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=theme+android+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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 18252 bytes
SHA-256: 8de909b97529c8ab7f87ea76e79892f00a2e31f9f2d649ea2c9c36a2a1b55474
font_01_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 10400 bytes
SHA-256: a15628755a4ec3460fb69461ed218a065c2a89957f1768d45143484aef331d6c
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.