Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ae51c0076af9c4…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 03:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 71acd51de43cbfd59e0024b6deec88e1 SHA-1: b8f4ba423e23f65262b1a0c9271f361def639a67 SHA-256: 71ae51c0076af9c41c235330d659a26d282d9d20d32c975e3d4487e40720145c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c436e757c60---bojiwajudisanuzogomuni.pdf In PDF document text
    • http://g-shocktou.com/user_file/file/tazinofatoj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5sqt50foaep3sumc4ukvro5ohm/43562503165.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e39b1a5e392c649859d625c822887f40/suxuponim.pdfIn PDF document text
    • https://bataretak.com/img/files/file/potiwuxitekonavonegat.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/22266274881.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/56014053618.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/takilolo.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/minunamesafep.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xovisafebufuvewimul.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/11745420165.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f4f02077---45112141688.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/hij6qnbosriov20h347pdgn9q3/71184839315.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bbd56f9a8a816348f5bc2d28c2a32c98/69612112173.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gt6ilktg5bio6t33gg65oj8grj/22539608040.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0597bdb354d019c1332110183510d307/tapugitunuw.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/826d9pjoftrcd6omo3ep17oi9c/60357692307.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ecd696ed643a8afb4673298564b610bf/defojewusogikifedim.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/2293741048.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fevuko.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f511f6b3a6ca64de87e6a2813ca8e0e7/jegekaxijiganenafevimaxu.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/jumawofox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fundamentals+of+financial+management+13th+edition+by+james+c+van+horne+solutionPDF 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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 17588 bytes
SHA-256: fa79cb31ba2d5f8bf05144399cbf311800882189b60593598c41a0005ff6f3df
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 11672 bytes
SHA-256: 17ea0096b8e6e7656b3fa35e7d51eb1766437c880a47b9d003ea90dcffe457bc
font_02_sfnt_off000133ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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