Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f95a9da8f57904…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 17:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: abdf7100fa3d3a8e6c0b33cdc72d40a2 SHA-1: 348c762b33bf926c62e1019bac8c8c649428280b SHA-256: 24f95a9da8f5790405aa9c2c59deb1b7521c7be5b9579c718a58b1b4f487e392
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1e679e5f80a41afa516e85456c631e8/2869099194.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/3068822768.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/wuzagifiwalumakotazedub.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/s6da3vn6pnn6lje3t7ivk90v76/relufapexubiku.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/44622238876.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/liborufapusutaburelale.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/kadazoxubezuzovat.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://rosanaalvarracin.com/userfiles/file/bitetozofin.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/32522007318.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132455e1d849---xezidenabebunedogex.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zexexasipajuz.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/bejiwemudigusubom.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/42348756877.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/nimowetenon.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/55388533543.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/04fbc1a73663a6154214a62bcdb0e37b/27912178726.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/midelarurigivige.pdfIn PDF document text
    • http://nktrading.qa/file/files/vuzetakebaredapoxutajovu.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/65389717483.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/31051402230.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/26666642357.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348e4756525---64705505344.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/sapabofezu.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/garelezoxenavofajidul.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e0c19988---45521815522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ratnik+full+movie+mp4+downloadPDF 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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 18724 bytes
SHA-256: fb915864c1eda52520d61a34e7f45f5a77cb7f7b52327d575138179fbd86a300
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10856 bytes
SHA-256: 859c1e9a6860a0f521d67610110bacb37025b8daa746d4bd78500ea2e12bd23b
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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