Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fcec81693c8ba2…

MALICIOUS

PDF

69.8 KB Created: 2021-09-04 05:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0c5153bc5c7733b0992446b150604e9 SHA-1: 00be5d1bde32d1d3bc185b05c7a12a274d3c48e3 SHA-256: 61fcec81693c8ba2d239a1ea827e049f0dadae4d71e8f01acdc302e86b32fb05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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://www.changhuapmo.org/plugin/ce1/ckfinder/userfiles/files/10568895281.pdf In PDF document text
    • https://alnahamgroup.com/userfiles/file/1469534176.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ot8q1gge62ct2ltbm39583luq5/maneg.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde7ab5127---lizetivamapepopapidade.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/foxujo.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/babuludirutawuzujetosilok.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/tukixolubemafijadoka.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fea5cca7a---zefefaxete.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/70528637686.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082f7acf2d---lavewogodeliki.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffce3aebb6---jirofalukifa.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/034df0595714c2db61157b1eee02d487/21630863698.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/57185905831.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d584e6509282d97d165a9f441fcbb6bf/90305285995.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec90455e---zojomaworujigisekijabuna.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/1682451740.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/juruf.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/38361030756.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/32175074814.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/xageluzegal.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/61dd56e1b57bfb6a53aefaffc1e85402/96642702591.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/laxamokijikufoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cuentos+policiales+edgar+allan+poe+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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 10928 bytes
SHA-256: 788c51f42c50d365641434f7910e9032836c671f4495dde138f7bc92e79d3656
font_01_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 15796 bytes
SHA-256: ec9b2e89d9a7d2d438089019de33baec3f083b28daf49f1f243814effcfaca8a
font_02_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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