Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa8f8a71e568ac1…

MALICIOUS

PDF

90.6 KB Created: 2021-08-19 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f782c912db1d0551dcd14fdf960c3261 SHA-1: 85c81fb642203c4ffda20e91b8d23912fccd7978 SHA-256: 0fa8f8a71e568ac1f101c855552b89f4bbf7981e6c0c386927e518f499d56386
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating it functions as a link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious websites for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://popnmusic.fr/userfiles/file/88327699179.pdf In PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/95818309377.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/soxuxifejopejud.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f37c1baf---22568788125.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/wujerijevaxoj.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t2hrke55q2qc4l244dt445fke7/20020485257.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/48820003898.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f51d7e162b2---baxigasesexezog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a4cf44fd0---21039973454.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e2519ee88---37192821478.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/vafopoboravaxozif.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625157211.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/71852133647.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/129341865061154b5479eb4.pdfIn PDF document text
    • http://acril.ru/ufiles/files/58552137828.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/eqs29kpuq65qh5cmohoriagj31/ratefu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c454eaa1be2---nimatedupipabu.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/55529588950.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1c1e87fe41ead731efcdc3ee732c9321/kararejalo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161145f062addf---maxupibir.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/zuwezeza.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4126a68c1b---64939052825.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/71496741328.pdfIn PDF document text
    • https://nada70.org/userfiles/file/94645524287.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mt91babkh12jlmbvh176s3h7h1/13334611031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+restart+fossil+automatic+watchPDF 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_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 16876 bytes
SHA-256: 21535cab2c5a5dd404730a04c612d47fdffbb26b39ba93b33437765bd068649d
font_01_sfnt_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 10672 bytes
SHA-256: 86f75b541f36edc78ec7796a36a132766a7810ccd30a4dee71933afe6e2ca3df
font_02_sfnt_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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