Malicious PDF — malware analysis report

Static analysis result for SHA-256 e237ca62c349508c…

MALICIOUS

PDF

91.6 KB Created: 2021-06-28 21:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aadc4f520e3bfd5136ced8d7e3d4a974 SHA-1: bf42324b1b65f1d2849cd9166fc8ce3fab0930fa SHA-256: e237ca62c349508c1e6873c0bcd1b71078d4e50897044304c3f918789c12a1bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and link farms indicates an effort to obscure the ultimate destination or to distribute payloads from various compromised sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02f1c9463---ravebajitobuximifoga.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f145f9a6a5---46125292672.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/79221834210.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9cf6f6ecd27aa8e7b01229d78f2d5b0a/97971247550.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/bug6e5aho2nrub20g8dpbkslc6/wuwukelenavomidonodekat.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2a4210803---1295130573.pdfIn PDF document text
    • http://446888.top/userfiles/file/vakotepixigip.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/10314989182.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074baf50e7f1---lorezovejofojav.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076d61c52d0e---77000237699.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/cc585773faf9af123512d6293ad68ae4/sojadagimupizagokimiwox.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd188ca01c2---73705360083.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/nozulutekidazeno.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1238ff0b---48765340558.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f7eaaac8ebb8ccb728ea7f32491e3923/42128529683.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gutukaxirukukunavof.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/28594284332.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160794f6c7e66d---tevutulaniged.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/977dd2fd34e896e4be4cfa0b32cb5330/dajapibanigiw.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5efd957c13---48308139567.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca27e28601---40254512797.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7320886e309036bf924579514db20211/vegezitilebiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+shield+foreign+dittoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 18120 bytes
SHA-256: 63078f39e9307670418e793b1639e122425a965d0dc012224ced6aac10cf3b3b
font_01_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 5876 bytes
SHA-256: 643f11bf04f9dff6930f9ffa735b4a2b2da79e4b0dbbb32edbf0ac4b83193779
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B7 10732 bytes
SHA-256: 1fae06d65afa8fea04c2f143cd8bac1e2eb01cdbcebbe1083e2886b06889aea1

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