Malicious PDF — malware analysis report

Static analysis result for SHA-256 8525b3bc7e10c4e8…

MALICIOUS

PDF

79.0 KB Created: 2021-11-12 16:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28b618f092b21ddf6011d406852cd127 SHA-1: 59676a9d80a4eb364f13a2c88266a5bdf4268ace SHA-256: 8525b3bc7e10c4e8a032431f1418ed67eae022aa18c9d1d47015260cfefd9133
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vinatech.com/userfiles/file/jimuzetilixagepejipi.pdf In PDF document text
    • http://emachn.com/data/attachment/file/69399973729.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/15597299566.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/nutaforizopinoje.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/21363117093.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/49414598883.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/zotaragivum.pdfIn PDF document text
    • http://rooptex.com/uploads/dojurulirikud.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/77075376691.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xugipulojuvax.pdfIn PDF document text
    • https://tsegypt.com/file/46806188767.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16160a5c46ebd8---numako.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7fc3aa98be2d6cf535d2b9385270c871/lamuke.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/xisabovud.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/59384819099.pdfIn PDF document text
    • https://estoniapools.com/contents/files/jezorizorutijijiliralip.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148ee1192965---zesediliv.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8bd465b05554ea40dbe44ebad918f54f/jananovolixowa.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/modanujifosumos.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xuzuga.pdfIn PDF document text
    • http://kotolantopeni.cz/file/latawejavini.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/27462188287.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/lejipegupugijen.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/94468340127.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f68aa54817f71e277eafc62203196272/forusesexuwo.pdfIn PDF document text
    • http://jwpowerwashing.com/userfiles/file/26711098230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=warriors+life+and+death+among+the+somalis+pdfPDF 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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 18380 bytes
SHA-256: 329f1d0db01ae439df2818f2b256f133106eeaf29aa0f79f3b3c812fc8833920
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 10940 bytes
SHA-256: d0a01fbc8403f0d3c1d51ee9cf75ed4cc30013d64f1335b1f8ff5378a9ad214f

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