Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b4aaf4681c6509…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 09:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e4faacb3ed6554bca696013b5f90408f SHA-1: 2ebb044995463b03e18e5860f0a5b87ec47428f6 SHA-256: f2b4aaf4681c65092427942eae739c810ecccb25e85286a458c86c91fecfd0cd
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 and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it is designed to redirect users to malicious sites. The presence of external URIs and link farms indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=meaning+of+protract PDF link annotation
    • http://nessium.net/userfiles/file/77612562975.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b1fdd36db9e401786303fbfca50af7ff/94059242037.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa35f389b1---33813869730.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tj0cjb551r7abkk00mf7ckv3no/kujabemekukeli.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/38801317872.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/marazexorujage.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/81521a6098d6956aa528409699bf2043/jumuxodimetarurid.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f26f7cb9b---xuwarikobara.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xefamopagenonovun.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c4d5c321---40041677541.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/mujomobato.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gc5g7bkumjgscvbvaa5q29n01f/4983840706.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a136572b7d7---zigevas.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb14be57c0---xozikepevo.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/1129631739.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/joxakudakazenej.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ppkckscghk5dcfn4al0faq6osc/gawerexonaruremusukil.pdfIn PDF document text
    • http://mcutech.net/files/nedojoxepezejukonove.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/49474997a50f8f659c45479147587668/4573411567.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4a318bb1---42072604536.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 16440 bytes
SHA-256: b89998286ebfa80f7803bcb58226192d43430c1d3aa0210ea22a89a970a55e5b
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10436 bytes
SHA-256: c8a41b74f97ee8d58abae957bc5c10bc896b4f633d2b415c06ddc5c0d7f3cc29
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 2988 bytes
SHA-256: 3591cd2a904fdb9db4783351afc7510e0bd6d9a33c99ac022d5772a7390a2868
font_03_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 22844 bytes
SHA-256: c42bad439bcdb118badf22c7c9bd78eb124e1f256350a50782892434f498bce0
font_04_sfnt_off00015c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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