Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d74f3a08215ba32…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 15:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1697c01ca52a026cac25c2aac16e69a8 SHA-1: b44bd7fc457d3c82acf87482c4c07ae5f6c6e435 SHA-256: 9d74f3a08215ba320f7c8eb8a28df792bfd404658d799462764dc0182b79437a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded links and the detection names strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tecs4.com/intranet/ckfinder/userfiles/files/69378426450.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/045bce951fea981b1f05a0cf7c36ad04/2289908403.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/27070031641.pdfIn PDF document text
    • https://anfauglir.com/images/file/46399133177.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/151413306793.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/wepavukoxamagad.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/94589509150.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/87616055227.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141538ea659d---28842394499.pdfIn PDF document text
    • http://cabini.it/userfiles/files/wekilowalozufonuwo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/05d81nol56rsra3e6333es4uv3/33995255183.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68f87180b---85129047692.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/17972321685.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/febewasav.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b592f70563---21646524608.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/safajonefuf.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9faebd244---saxukiporomofalileta.pdfIn PDF document text
    • https://trystsalonri.com/images/file/sekenuriwidadefefagavi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/junagijate.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/21332954296.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wisakisemuniwiwerozukesox.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/69421125805.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136943687afc---89528894189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=canon+in+c+piano+sheet+music+easy+free+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_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 16928 bytes
SHA-256: 5ef998e5e42bcf46ced591b6c8d9f65710e2ac7dba688823ebac29afdfdd1f00
font_01_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 11084 bytes
SHA-256: 6a446cff6fd5f2bf6e802cebc254ae85a74c756ec54cc5490bd7f893ec9c64b5

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