Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e814096d3737a47…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 04:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8c3d9dd4335a08656e967ec89a7077a2 SHA-1: ab401fb279778616a4f237246b48f5a125ea1ded SHA-256: 7e814096d3737a470ea3c31da659bba3d9241d420cdb271c47e7c1ebb109a5b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://zxpgw.com/userfiles/file/97163721607.pdf In PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/bilenowejuzodano.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160752bcaa2f77---bekonesazelepuditukoto.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4oh7ucb2iae86meph4b21vo2ob/gamal.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/85036937827.pdfIn PDF document text
    • http://yuha.be/_files/file/9570776291.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5c5e7d3efbbfb9c3fd2006db847d94ea/baletenudijup.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/92367028613.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ea4bea1---begipabinirowilirolojojud.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/71032033142.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/lejapakeboputosevid.pdfIn PDF document text
    • http://mextro.de/upload/files/juvufer.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/xuluwudapawosaf.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ee8af28597975153d8138e7f26942a5/xokewonivot.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627544691_1.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tovosaxusudopoloxurezipub.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c3b7aaa5262be836c956401d85b36ecd/71768938232.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe049bbaa---99573146121.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160832c5c8c14e---64469324942.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080115271398.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/minapenuxikuzuxudofexol.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/jedoluped.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d24e6bc2078---dovazesumedidol.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085104b1fbb5---90518804099.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/82652646523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mahapatra+sir+sociology+class+notes+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_off0000b900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB900 11004 bytes
SHA-256: 0449c09e0d3e7853b701529cdfeea94ac7c46044b0923d8f1c5784116128fabf
font_01_sfnt_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 17556 bytes
SHA-256: 0282911c9a9109c936555d1d903e4a9a7e00b654030b67a997ab9e7e691c0e0e
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1