Malicious PDF — malware analysis report

Static analysis result for SHA-256 32723c2e55d8dbff…

MALICIOUS

PDF

98.7 KB Created: 2021-07-06 01:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5bf81e355ed1c89887069625c57d9d3a SHA-1: 595419750472c94f7580662c10d387a2fc3779ef SHA-256: 32723c2e55d8dbff74133f1d09b9f59c8740d7ff6b5f500a119c4b7ca651ec8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=song+at+the+end+of+hotel+transylvania+3 PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083a83390113---35340673283.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/fubetudawifi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5rcga4c5d30mi34ejmud68rmb4/gidosizunuvepofolaseb.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gaktvau17ja1kv01eo2m990kj5/kofaxevel.pdfIn PDF document text
    • http://deforma.it/userfiles/files/sagubawuviwaxifas.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c8d192ab---jekelejasojokat.pdfIn PDF document text
    • http://www.moyekolodin.com/files/76998748592.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/jasisonu.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/bosakiwekatiroxovizuv.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/rg2839eldrhhb5gim68gj02sn6/20603396196.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7eefa8de2b864431d85e1d89309ead68/minesavipenup.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d680a0418c8---4843018453.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5c7060c8cd7fd1cccb19d61fa2e672ff/97043324493.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/72b1974e44de71eb3da7de556837e65b/58788920142.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/68go2lig9mci4c33ngchmt8372/bogodokalek.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fda8278fd---93549373320.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/rotanofijimimufu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447f3b9f5e---21017579631.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/bubevasogumuladofidojese.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/79739717662.pdfIn PDF document text
    • https://luminex.pl/upload/file/69814540466.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69833bccc---vajefulosarezotuzerifofen.pdfIn PDF document text
    • 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_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 17924 bytes
SHA-256: 3210e1fbdfa33b76c616fd290d7c2035230068325ffbd592cb69cef50189a8cd
font_01_sfnt_off00014be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FD 11060 bytes
SHA-256: fd89a3073689bb9f0bfad542c7adcd5d1b5e9248c6fcb8a838a5770cfcec7c59

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