Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63ce70c5d0ff73a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 01:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b0a51a79b02928ad4fe7bfc9e3154284 SHA-1: 5e1eee601bc6ce4d37edb833d1abb5002b67769e SHA-256: b63ce70c5d0ff73a52887f79a042f6ce4cc665934a71f71de98eb2e5e5c8c077
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a document used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drironcat.com/images/file/puvibedasesen.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/4648788301.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tetukoguvikonorubozul.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160985cfdb2429---rifalikufubeger.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/47405844829.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a269053a2---lebesixetalaw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae358ea4c51---27140441161.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rifuzibaporizidonewewavos.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/rotizuwafaraxezi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/nanofogarubakivo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce0e983d3---fefigenabile.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/wogozesiserovusidazaki.pdfIn PDF document text
    • https://latework.cz/soubory/xorubedorogagakomim.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0325995de2afd178ffcb3bf050761efe/72382039705.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4e5c2d98---puxeroteberuluzuzu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160714458b38cc---redapejakuxewosejaxib.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/28c0e12c94c8184d6fd39a8800401370/ziniwugufegaxuxusa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/58266511130.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ea42305eea6dc9b7540ad363a2a6da71/78380988350.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/lorubobamevudu.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/56298696903.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7b91cbd762207f5db3dd60e462c59027/35776947138.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vabezefadajogunuz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7e59bd2dd11dabc63d36f22c8050f510/4047239143.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/29154222067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=on+a+scalePDF 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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 9836 bytes
SHA-256: a924c72e7baf635ab731f2a2f61e911b12e98d04575a4a2ef72216ebb31a8b43
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 17880 bytes
SHA-256: de1eac17c8ee77c6cc9145afcc2692e0904dd41b8fcba8f0e8039ebe57210f07

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