Malicious PDF — malware analysis report

Static analysis result for SHA-256 351bcf780c0c0077…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 03:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 84cb1d44a4c62c3ff0316edd9c84a2d4 SHA-1: d42ae3bd694a04b20a335d280377dc9743686e01 SHA-256: 351bcf780c0c00772743ca2a5c5619fe1d679ff3bd4c34278dfe02af80425617
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Web Session Cookie T1056.004 Web Browser Data Collection

The ML classifier and the 'SE_MFA_LURE' heuristic strongly indicate this PDF is designed for credential harvesting, specifically targeting multi-factor authentication or one-time codes. The document contains numerous links to external sites, many of which appear to be compromised or disposable hosting, likely serving as landing pages for the phishing attempt. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://archism.ru/uplcv?utm_term=confluence+app+apk PDF link annotation
    • https://vyaspublicschool.com/ckfinder/userfiles/files/30001809242.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/9716831848.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fd70b2a1---jifefi.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/55688443745.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/22469443085.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/xironazerime.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/kerujibenobamez.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/71960986356.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/75108629512.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sekunonawefopolikijop.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/8372867026.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/47947239749.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/88376781792.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/rajanimeladerize.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/uamf4d9oc6vqfb8d4kvufof9v7/nofowogakimotenegol.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/newevulede.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dowajafol.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/82391397179.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/zubuzutidivamuzu.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/14953747978.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///98829068675.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/kizikugexuboreb.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/656mvcearqvfk2qnoi94suh0na/74163182576.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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 18264 bytes
SHA-256: 56d02957f22f8552ae34f070f7297e27e8ab9b880548c51211b8def8c5b77776
font_01_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 10236 bytes
SHA-256: 2b9e3da95016c362e8a4fa3d7193d865edb0fa247dfc748b542d465943dde22d
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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