Malicious PDF — malware analysis report

Static analysis result for SHA-256 32134f45760a1b2f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 23:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a65d7a9091a543e97b4372f18562363 SHA-1: 22ff569e674a1a6b53545fdb0a0f4e1eee7ca47a SHA-256: 32134f45760a1b2fdaddc42237683a3c3a5da570a585c33eb1280cc8aeeebc0c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged it with high confidence. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://nomylo.ru/uplcv?utm_term=entrepreneurial+mind+book+pdf PDF link annotation
    • http://thuexedanang247.com/uploads/image/files/vafanaruvijaguluvi.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/4710028786.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/17092549631.pdfIn PDF document text
    • http://gugugroup.com/userfiles/vusodanowogipawamewod.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/25212306672.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/nixumulikekodanuxo.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/8022714384.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/gepilunuj.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/vugevasususezuweb.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11737620289.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/48917724626.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/kinakuzokikaku.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/8484149528.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/dipemudegifalo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe6fbf8a5---39842352340.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/mawewisiruxunu.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/70977232827.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/mabuboxusatiluvi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342801a686b---67794640853.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/detanonagelexaxogajex.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/19384588767.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/88947875961.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3b9276192---kakata.pdfIn PDF document text
    • https://derfo.info/resimler/files/todalenekux.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/xizipuratapubevat.pdfIn PDF document text
    • https://cargotavio.ru/files/file/87381727141.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_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 10808 bytes
SHA-256: 94050e0e1fc724e926042169d9888b17fba513d102bb0fd54cec44ff9fd3f264
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 17468 bytes
SHA-256: 68a6df3b83899a6994b7880d8f79692541d28528950ddf4e3495dc2701fc928d