Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e3f01375fca38d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 02:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 84c626ac398b14f4b246e8a2d96f9781 SHA-1: cc56c9ffac6fcd471ae2cbf879bcb9d46d95c262 SHA-256: 97e3f01375fca38da6e3d755ea068edac3d3fc40b533c156b47b40edba8a56e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, likely for phishing or SEO manipulation. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://chcial.ru/uplcv?utm_term=meaning+of+area+under+the+curve PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f8d702d7---31141426370.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/es23pulm3088ph8bfht1hfkh2f/temewabefono.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5752e149b---jamumola.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/82985027703.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8bbd03a2---26235172757.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75897197254.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/57436744331.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/kowokapamirazimotuzi.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6d22e2c8ed3b252b8bdc7a1d91d819d3/baxinusegixe.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/gonexaximivabikutiguzeluw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/14889853762.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ec47f5708ad5baf56ec9abe9b683126b/95569316125.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7aa29bd4---91903517631.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/10699139288.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45138808037.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3nildfm9o705ss8bepsfnjhuc8/42557450368.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/tonogagexumirumodado.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/1419237994.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/rosajezamoj.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/kuzatidoma.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3rvpfv7adm8h9fit61d1uvgro7/sixuramunijuxone.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/55285469854.pdfIn PDF document text
    • http://foodchemsino.com/d/files/mukorakolefu.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/kukosafenogisixutoxaz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ded1035b6e---kubimigetibivimi.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/86856104518.pdfIn PDF document text
    • https://doi.org/10.1007/978-1-In PDF document text
    • 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10700 bytes
SHA-256: 80b60f07daa8a620fa55a9394bd79c5b66f05c2366e76659f2aa354de6aeb608
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 19380 bytes
SHA-256: 49c176acacce1c54ec2322d6ec5cdf979abaceb4578f9a2de9310d76a05f6b21
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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