Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca87132e4151ba4a…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b781c2292a59f1c6390823b0b9308f2e SHA-1: ed1df573ca6f7cad2293675e82232236ef24d358 SHA-256: ca87132e4151ba4a2c9d425c5ee350cd7b9bba2487eaca4df53ad32220db31b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://derey.nl/app/webroot/files/userfiles/files/20774147271.pdf In PDF document text
    • https://naoshima-habitant.com/gepezalised.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/srsr4dfbi0jff441rchltpgob7/30382651887.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/38198512006.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/45699267730.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/jojop.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b39d3fd10fe72f699cb7939c02879bc7/tosanitawedibefewurupo.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/repoxesi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/19fc9dd7abb47ef49270468e0bb78559/kawenesuropanevo.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/pexixebix.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53460435821.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210804_F6823F1E87787B2B.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/26597571657.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608522b83454a---pimuvepuxomuweko.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/23279740684.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/jelinovizej.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/25710647618.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/02e79e3ead97ef34a81b8fe896299599/57948516263.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/da4p7o8u1p5fcrbgtdpr3no4cr/50340812582.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/23979620405.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/69427653087.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/jijekobubuxuzetedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=managing+global+software+projects+ramesh+gopalaswamy+pdf+free+downloadPDF 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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 11528 bytes
SHA-256: e384281958a19ffd7fed637d112bd9493c8eca6a419cacbc039ab9638c78fd7c
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16416 bytes
SHA-256: 044def514a8811c09cc24683097d405a3f81e3e60ccdd5a02a87bfa4a51b9074
font_02_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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