Malicious PDF — malware analysis report

Static analysis result for SHA-256 1def89101f99b92c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 18:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e24f3bfe8145be130733379e1b1e73da SHA-1: 339c3afa39b375f3fba3909f8dc111521d852a5a SHA-256: 1def89101f99b92cad18a57515a32443943cf9a151f9e27cf08de93d32f5ace2
196 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and redirect to other malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://educationindiajournal.org/ckfinder/userfiles/files/60273062992.pdf In PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/99096719214.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/26888883924.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/bonemitawozagudip.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/68742692765.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135054b653a3---41751676220.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/vinesejivazo.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/gurosejegefesesomalulig.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/59970496899.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc6bbfb33---xesofo.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/45946219666.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe2d6727b---betavesolegoveto.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/924b130443803c25471d0543797dd43e/jibatokuvavivikurudavexu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3988bd89---diwefovofil.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3kisd06hsnsps3kh4bumenchc/83449605775.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fewijajikoposajowavi.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/9096200991.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/4492593567.pdfIn PDF document text
    • http://timebymtm.com/upload/files/87100500766.pdfIn PDF document text
    • http://salkim.com/userfiles/file/xemake.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/zazif.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768618b4926---33608993572.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2edfb6d80---78802338603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jenkins+tutorial+point+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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 18060 bytes
SHA-256: 873ac32cbd0f94de64ffada64354534ad84d9693395304edac4369a7c978c315
font_01_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 10672 bytes
SHA-256: a45190fc3546f4209ac8dd2a182c15c58b3ddf21fcc5de0ff3ca1b3b0ba5da3b

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