Malicious PDF — malware analysis report

Static analysis result for SHA-256 1749e97e84ff3a31…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ec86e307e4179de377e7a3945f70dc03 SHA-1: a0d4ca5dd35fef98c5c32d2730cdf7e84e0fde99 SHA-256: 1749e97e84ff3a319298b5be0f49ce926db555e9df20af5b0885facb6742cd63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous links, including one pointing to a compromised WordPress upload, strongly suggests an intent to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eletvital.hu/uploads/files/62729207164.pdf In PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/rotari.pdfIn PDF document text
    • https://cristalensi.com/public/File/bopejisifixomewoj.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/vanokazaposemi.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/24301689738.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613581f616055---25719806092.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/31880553552.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/50557117083.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/tb1c6nnvoj97rnrnsgo4binh37/72312827763.pdfIn PDF document text
    • http://domainecomps.com/documents/files/zuduka.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/468f66bb498b8c78bb9f61666bcb8803/lemavajajo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b438472b---xopawogadidelimetomej.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/wazugavezasaroluwef.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/52709107947.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bufuzudumafugewal.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905180302650.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/76098815882.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/8264191048.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/96839161137.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3c1bdc5e06e0087c96768379333cef0e/tuvasa.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/nitemekebule.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/85082914094.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/7415753827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shadow+fight+2+hack+updatePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xojugo.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_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 10956 bytes
SHA-256: 536a4311eaf6ffd41ac8b3a895c62432b49b211d87c420ac0a8209eedca82501
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 18408 bytes
SHA-256: 1482ac6593ad9afd67dd1911263569db9602834ea2e43aa42893fa54bca1eeeb
font_02_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1