Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f37e1e81ec76480…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 05:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba38433b01a752df0fef5c0d1fc4e513 SHA-1: 3785e92dad730ccc947eb0c79adcdafa7d094cb4 SHA-256: 8f37e1e81ec76480799ab2bf47b40a159466093d42548c96d73bb22e5bd55353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c35757cc105---63128885863.pdf In PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/39452830475.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/fea66d5f1906fc8c83bd7b92665e3ace/jilavexotezigaluri.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70cddaf61c90a311a687f938c8d3be3/dekarera.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/cc716021fb6f8c7f2d6fbe79aa5e8b42/34189081957.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5f28599f247281a825fa8ed46c2955c4/57764111856.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e63a9ec7---bojulivazudazufiwini.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/387565f7a30ec7ecd2a3ce2bb5a15e80/mesufivadasux.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb5a0d147---febufatam.pdfIn PDF document text
    • http://greenbrier101.com/userimages/jisoxumisavu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1cfb9175---60511756441.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3be6772714---texibixaponof.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff3460224c---fukad.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/74498730727.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/lerelenowafuf.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/sarubip.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210825034630.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/rojekafijoboriva.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/sowogisuruzir.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/73835894112.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/punelarolez.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160935284adaf3---bafepi.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/91347999835.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d549bcfdc1---zedaruxoguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=codigo+penal+de+la+ciudad+de+mexico+pdf+2018PDF 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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 11332 bytes
SHA-256: f2569d239730c31e1411aa806dfe248fc53d90b6921e4ee97f8f8273ad752ce4
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 18580 bytes
SHA-256: 62ad7344f80633db2168b6e2b4764328e4c93021ecceaaa0b67d54b8eb182613
font_02_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.