Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f7ac75807c3ed3…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 01:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f61d921bb42675479e164d8545759e75 SHA-1: bf7d132b94fe5622805fbcff384abb7c8246e2b9 SHA-256: f1f7ac75807c3ed3aad01fabaa0c3e3d23e000e28048412333118cef74fa03a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nafanapebikagigip.pdf In PDF document text
    • http://campingwithconvenience.com/files/files/68978109512.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/66979577018.pdfIn PDF document text
    • https://renewone.de/files/8246242547.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/piguxexapinuwije.pdfIn PDF document text
    • https://bselink.com/userfiles/file/banusetegajuk.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/58345820170.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907040220733064.pdfIn PDF document text
    • http://ifap.it/images/file/485134223.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/mefisoruvosidunir.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/49004827582.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://evolution-dev.com/file_media/file_image/file/80190937809.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/58414865220.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99684435547.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/bofinuxowobaruna.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e729db33d6---nisafutimi.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210923145003.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pukik.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/36388085505.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/37235188454.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161348f6e20fcc---30501556949.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lumedidapivimovurofo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e140f5372e---rujidosimagujeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fake+gps+go+pro+download+freePDF 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_off0000af64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF64 14636 bytes
SHA-256: 3901facc797cb71c3be858166e651f2c8527ea0e4ce57042be99ac7677494a22
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10640 bytes
SHA-256: a4aa771f1c171c23ef2e4e528f5e67dc29317c9e8994b42ff8d2419bff915b48

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