Malicious PDF — malware analysis report

Static analysis result for SHA-256 041746d068598e55…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 15:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b776519b7463145891d59b8f0f62f52 SHA-1: b951f4f3e40177af40072defd34407d250eef4ad SHA-256: 041746d068598e55e4687463a302fde3171d656ae5489aa9b2789e78b565e140
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting sites. The PDF structure and embedded URLs suggest it's designed to redirect users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://taskentcompany.com/userfiles/file/41064132668.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114e342986d0---xidivefum.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a5dbdb585ccb2e6f678f2aca26618603/fekavixavefuloxef.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/37452711503.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91816841314.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/4359289856.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/67449244237.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/nowojixabebuzajetal.pdfIn PDF document text
    • http://skolky.info/foto/images/file/mevarexofodafojin.pdfIn PDF document text
    • https://activepymes.com/pub/file/zixoja.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/98330359171.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdb4d6f96647a50c0d68c73acfb35e8a/sijovitoja.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/modetorejumenixemilezujag.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e846193f---laxejimomakuji.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gijiravezerezedojepobipup.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2b3uj5as9hvbkkgh1rdi1v5pkj/pimidesifudekukekazofori.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdfb53a44---47556820962.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zazobovizunatukozabiloke.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/16016432089.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/51126684438.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/12330606141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sda+lesson+3rd+quarter+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_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 20476 bytes
SHA-256: 81081e25a8f495361c40e0b65c3d03b39c7760b21fec68a441d982c19cf1951b
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10892 bytes
SHA-256: 5ad2e8ffad086975836e90b802847226f20a35e0b39c1739d0402b696aee1a09

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