Malicious PDF — malware analysis report

Static analysis result for SHA-256 271ce496e995783c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 01:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5b8d9c32282d449c1f4771b1511c1ed SHA-1: d99e052ece3c5253a280369dedf23f5b8287b273 SHA-256: 271ce496e995783c6006e9afe33b2e984ef06e1539d59a77e6cd73fd7eee63e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for SEO manipulation or phishing. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely involving embedded JavaScript to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://civilkontroll.hu/uploads/file/13998204414.pdf In PDF document text
    • https://breedlife.com/upload/files/67764188619.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/92727823527.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/19933095212.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/90643046955.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/14345910363.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191986322533.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/91921058760.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/306a890f9dcb7d4f05e64329c7274a83/62003110679.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/mojovibo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3054a798---binikukef.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/revalibazorimi.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/21047961921.pdfIn PDF document text
    • https://upaspor.com/resimler/files/48314571821.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613175be24fa9---givodevotobawo.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/87071266301.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/67167159578.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/7101575420.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fcfc36707---7046355999.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b58772accd5bae7cf495f06e0258f1a4/85144163797.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/70702313599.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2ae0102f---janeped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+football+strike+hack+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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 14708 bytes
SHA-256: b833b8ddb7019157e4394a04badf4ac9d96833fbf63b70ed6e7f77c7968f9c7b
font_01_sfnt_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 11036 bytes
SHA-256: 8d0239c8fd9b852585453deef3d81a8e4a65f9953dbfa7be9cb0b380918f4ab8