Malicious PDF — malware analysis report

Static analysis result for SHA-256 35551ca83d48fb0b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 05:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b5b6b7b4af07a52896ce4f5c076280d SHA-1: 332c5ab1841af67d54bce5150b187ed9cfdafa72 SHA-256: 35551ca83d48fb0b4e4aaec0581c3b6ae214e42076981b23b88844229d101a3d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://siciny.pl/userfiles/file/53216121927.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5bcbc990db069f9e5cf25b948a14026c/jotusosozasedut.pdfIn PDF document text
    • http://pb-book.com/user_file/file/dabusenenaminej.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/52e08a3052288bc37e49abc8acbe6663/dezixokosukosad.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/l00ql9ak7e0snv0l40qen7olts/91591116853.pdfIn PDF document text
    • http://hueide.com/upload/files/75532729615.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/57730782461.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/37622809114.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d95490b1b64---86536815277.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/bipave.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/ralufat.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/soniw.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/61305791611.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7042f231b5---90600588242.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/87756183836.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/57794196065.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/74054598284.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ksepfu6hcqamatnpqsp400efu7/28989479243.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/2874694506.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d35bc6775dbcf9be67abf4aea8f9a219/32937324120.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/91234551663.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/savijagazukoxofes.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/34863724629.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3875135131af699301b67755f2a367bd/kixukab.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/vezazemuremorebajavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=romeo+and+juliet+word+search+answer+keyPDF 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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 17564 bytes
SHA-256: f0c356204b9129597c9f34dd9a46443694b7b1466910a900601ac9b14582323f
font_01_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 11200 bytes
SHA-256: 8c1df5215fd969e8f3da80be50e94e128507dfd9665639ea53a656f6142f8c62
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1