Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d077af9ae5373ec…

MALICIOUS

PDF

90.3 KB Created: 2021-08-16 04:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9eb0153d4656c23c7693c10758c94d16 SHA-1: c4a265d3e32a96d751dee476523a4b2c43fd2b96 SHA-256: 5d077af9ae5373eca161759bd05b59b79290fd841b629dd1169a76d83b077507
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is used to facilitate phishing or malware distribution by directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://isagenixmakessense.com/ckfinder/userfiles/files/27897485479.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oqp94q8d5fej5qs6d8uj3l4o8d/47578067692.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/18394973469.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/wegujejagadigukalepa.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad84594c67---rakinagakozegofira.pdfIn PDF document text
    • http://rococosofa.com/files/files/24955131250.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/maduperatufakedozalusi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/1fc6b4c937d6174e2ec3e644a97f1270/rilalisilesejij.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/89367196223.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210811104211.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/baruxip.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/33913677299.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f75772bba8b02949ec5ea8d50d964e3/70530745915.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qo5fnuudcbavv3q97qle7b61v3/numikalupoziwidi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4ed6a2e6---46583465158.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ce7e632bfa636e7c3a0731909a32f871/25205114689.pdfIn PDF document text
    • http://lawngo.net/fckfiles/58874784762.pdfIn PDF document text
    • https://koratspring.com/upload/file/zofovodesoku.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5088e7d708---45065157933.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077cba6d5eed---nifavitusubivotuxi.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r4oogcr9afmermbav0i3bb3dd2/55840784511.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3bae83a629a8b5a7c3244bad94bdcb6/47152433870.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jvcgc42cfqif79pfd2dkujl7g2/dabapatimuduxujozo.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/37054883051.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/53657931590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=recommendation+letter+for+graduate+admissionPDF 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_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10964 bytes
SHA-256: 224b4ad8f76ee9c32476fa440a8ae13006368a81662b41e0d8bfc004561fbf30
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 16360 bytes
SHA-256: e22784f1f5dd1cf29aa29146008eee7cb03b47e2e8b5961ca225f9e19b425cb1
font_02_sfnt_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1