Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58dab23139fd8ab…

MALICIOUS

PDF

99.0 KB Created: 2021-10-05 03:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9403b1d1afddd6ef19a0eaec04d38063 SHA-1: bae4eb45de609dac18d45cfd7995421e599cf7a9 SHA-256: a58dab23139fd8ab4887ee900438fb7c33823ce996b213b45841e414f74c11d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to a variety of websites, including those hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=sawyer+brown+can+you+hear+me+now PDF link annotation
    • http://edu-soft.ru/site/htmlimages/file/88295865312.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/66789574841.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/20059347619.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/99054717963.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/ninokek.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/h65jv9sa2mk8vsupc6v15pul97/zebinasonusamejevepab.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/naxarajefijufanudepopax.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/mawonutamudexogu.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/zafibujopijevujixotoraxut.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/67019018612.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210925_063BB6FE90995585.pdfIn PDF document text
    • https://strechybenesov.cz/content/15934496706.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021100120320929.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/93244919659.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155c6e37f7fa---desatewiga.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/pokofigugolup.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913234724164397.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/vavezixixeximamavelipiw.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ngmm3tem8qv3nkbiu893e8h6d0/83091323050.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/47125262122.pdfIn PDF document text
    • http://rpelektromont.cz/admin/obrazky/file/suxuv.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/98129733535.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/72440993510.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/22272265518.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_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 18192 bytes
SHA-256: 2b3c3613652338792a2ad552b8171726f518e528f2e73dfce0decdcb4373a631
font_01_sfnt_off00014e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16660 10604 bytes
SHA-256: 5b5bf41350f611aa0e5f5b573049a47fe493db5da62775a5f8d5e6875d81ef00