Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd445c780820dbd…

MALICIOUS

PDF

79.5 KB Created: 2021-10-07 01:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd0eda2408cad72a0ac27e2458473ce5 SHA-1: 4e451c13a4f5fd57d1099c9c0209e6e0b7ad46d0 SHA-256: 5bd445c780820dbd5308d593231dd2bd0401f2cc4f884463c3e142587dd5320a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of multiple PDF_URI and PDF_RANDOM_URL_LINK heuristics points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 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 http://s8radziejowice-paszkow.pl/userfiles/file/xavuxonidixurogene.pdf In PDF document text
    • https://indobaliart.com/sitefiles/file/jatojirobagojotofosikel.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16156468b3720f---77528139941.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/70156566284.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/19268609748.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/mosisopemiluxafenulan.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb374c668502a299bf558ba7ca84b6e7/rujaxekadiwisemixogi.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/bopisegilogirimemifexetuw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85097540756.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210911060513.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xozasuw.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29634394444.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/80086862946.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/xonokamovo.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/xarijiwoperiwufun.pdfIn PDF document text
    • https://linardi.ru/files/file/65061322296.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/41065032107.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/penexizuzodotow.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/3165810621.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/63038baa9e16ff0a1ce006f6c8b4ff1f/51124968164.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/sipatidumi.pdfIn PDF document text
    • http://getvisa.ru/images/File/zuretetox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=spelling+start+with+bPDF 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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 17344 bytes
SHA-256: 509f1e114b37c397a68ee3e19a1a75a77305caee36a8418d1ec1b2023e4524e6
font_02_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 10712 bytes
SHA-256: dd12a3e5657bbe1d5162df9a4de50b2f7cda90e44f6f90c1c1cdc91e46dbdfe0

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