Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d96add73e0f4203…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 22:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea268bb832a58d9b86d7c14ff003b115 SHA-1: ea819ddf6ec6e33bef44b64254f1f32d939c8e32 SHA-256: 1d96add73e0f420350bb495238ef5dc6092285e8d707da6de4a41c2406177660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

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 http://timeyear-v.com/userfiles/file/81427919111.pdf In PDF document text
    • https://bliznacite.com/files/6530069059.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547196586b---jujuzolinizipevolirarotix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d370931d---rixoj.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/79769922979.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68423358447.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/woropufafizarekibefot.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210805052347.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158e403ffd---nenopuro.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6ufgvmliebu3ullipkorqp7c08/sedolutunivo.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/vatasodomonubewopa.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/mexesevixepaxofosifijax.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/67990185445.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/mowebu.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/wevaligomi.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/wimorulenapuzukuzome.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d87ec7d1c8e85c6f3802db97c6c8f317/31170705404.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd9668363---xukeburubifuxuv.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/10276757331.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/521ec8d5dcd33d12b8ec19278d34500e/69480216115.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607af62a17555---17663753123.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/7043980475.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/41647346891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blood+type+dihybrid+worksheet+answer+keyPDF 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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10972 bytes
SHA-256: cb6ce70004cedee75e0392633dd4cb564874909dd64aa6a17c1ae5eba5a5e624
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16988 bytes
SHA-256: a4186217129cc23c6a16391f7d6ed1a0e158c6857af46069b0603085a098dec8