Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd485e7c7241d9ac…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45cd6c55974e13add503f2104c739fa5 SHA-1: af8349ecfe6c9f3a8025f2e7e3b59f8205db074b SHA-256: fd485e7c7241d9ac54f392c7df8962413cf90e1cc24dbe66eaa7e322529f75c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=should+i+workout+before+breakfast+or+after+breakfast PDF link annotation
    • https://sicurezzaips.it/uploads/file/xowofatevagifazemusunena.pdfIn PDF document text
    • http://standardamulet.com/files/files/zoxaxux.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210907_EF4D02827346F4B9.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dce77a948---pamexeganuw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d729eebf042e9a5a4cf4f4a2d83bf8d2/buxorotuwoteguzimojikuj.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/52709480717.pdfIn PDF document text
    • https://foulardfotografando.it/file/18295712613.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/motoges.pdfIn PDF document text
    • http://inphilong.com/upload/files/salinezik.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gogidamikurojekinuvaf.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109210641446180.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/67e6959a3882da5c0b7207f9d79e9339/zetatuxuxubibu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/nevomewovujav.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/48646740008.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/25176376686.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/belefebasuzero.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xuxawixudi.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/kifujupokemagow.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/48623053248.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/lozitezoweko.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/17535767140.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/tomovobekepuwejomazapu.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/wigojokifuzexajotot.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_off0000c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 16752 bytes
SHA-256: 29b77b6a209d7f015cc163ff3e6c6b61d7d15bd2a98baf49605324a7db19415d
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 10840 bytes
SHA-256: 16298289fa9b18c0f58591ca1bb6461c57375276b30365020f8ab4aae3d4a3b7
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1