Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0961befb9099cb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 10:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73a08ee47529a2e25be3d11491606b27 SHA-1: dbffe30d78aae0bc59171708b99dd6e22ce786a3 SHA-256: fc0961befb9099cbfea619db190eacd47b0744ca72cf731732d636acaf7fa6d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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.thunderesp.com/ckfinder/ckfinder.htmlfiles/12825609384.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51760627---febakukipubewisej.pdfIn PDF document text
    • https://fishboat.hr/files/60396293249.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16141729335533---kidinolelikuvibadum.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/rejulepuvidanajewovafax.pdfIn PDF document text
    • http://megalaserasia.com/upload///52864032097.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/66470912490.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/50592135199.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/38048444762.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/61389764016.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f07fa4257---jinoked.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2e75c149---wimewunupipazeji.pdfIn PDF document text
    • https://penzion-palice.cz/content/31820314283.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/logopijibexubabopajet.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210913_230947.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/jutamunudewulubirolu.pdfIn PDF document text
    • http://vhshf.de/File/97934881854.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/18puttf1u9nhovv8jme0q3vdmd/26647513142.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161300ed158d5a---38474410893.pdfIn PDF document text
    • http://nanopena.cz/upload/file/66048507906.pdfIn PDF document text
    • http://suurelepa.ee/data/file/mimamipomupipepigetaxa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614038a1ea1cc---43965515445.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/27184212211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=most+popular+gba+romsPDF 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_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 15576 bytes
SHA-256: c07d8c9be2995cfd3146b268cd7af8402b1ead034430f44a9616f641b4026bb0
font_01_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10500 bytes
SHA-256: df907742bf77f0000e544bf49f6bb758be2e5e2dd635e2442dbf68da3752768b

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