Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe79b21918dbd015…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 06:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e938323893838d3d1043cb797e630639 SHA-1: cfb665efe09ea7d43053e480eda6a6a7832aa059 SHA-256: fe79b21918dbd0150ede72102e16c7facb8a53e16045be66be797e6532498ced
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ecohort.com/userfiles/files/momobazuvebujoma.pdf In PDF document text
    • http://forti.in/userfiles/file/521134717.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/21e52f3d31910f33894a708124db2520/34572977647.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94faa5aa1---33344283077.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/vidivo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/90789688465.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kuduparakukamo.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/80423969361.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282877060d---zubibas.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/31467705380.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/43281482858.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2g38ife2blc9k31dhh2remmgp0/36024284498.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/63005476710.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d5077dfe264183c31a93649c990ace68/30896844431.pdfIn PDF document text
    • https://aedwea.com/upload/foto/48962826317.pdfIn PDF document text
    • http://coachhouse.info/assets/file/ruwagisoxovu.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/winubel.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/22461565170.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/13347373157.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jotadivukinavixopufaxono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+idle+rpg+androidPDF 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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10620 bytes
SHA-256: 0a8604879a650174209499d38085c3427661387b464b88ac87d456486ea61017
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 18004 bytes
SHA-256: 6fe59beed65f7cf5305f22d1b5f0a1385681c66a099d5cdb8d88f73c69e4462f