Malicious PDF — malware analysis report

Static analysis result for SHA-256 4619d1769383d9a5…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 19:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4081a7fe831b55f73966845e867b13f5 SHA-1: ab4d155a22440752425d190bace9e41a5026c21b SHA-256: 4619d1769383d9a54c4b2477b77a5288ed2e491389a074eaf817000697843948
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gtlitalia.com/userfiles/files/lopedinajoguvixazipetij.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fe1e899b---9540287522.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f62714a19---dadosajataxen.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pt0o3em1s5qgtq1qj1p8eiukc0/22252805548.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6uoel77qg5l72k07lvr1och4p2/99283240873.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vujoribugilurosizidajobot.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210528121459.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2d510a9854d1fb9fce5d12648341bbe7/33160544528.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-24/20210624120742574742.pdfIn PDF document text
    • https://hgb.se/filer/file/dugobumi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/147ddcb30ce796af69839ef5db78627f/maxakiwoworidijudidopiz.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5022b6eba36a0622de225c8276e3a19c/kuzikuzas.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/kevrbf6flf3fn0ge28s379uobc/23845277816.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/uimk3q0q2kpeffhtc7n6oiot1v/59074064855.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/munutexipogopupaz.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/kokevutesewim.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160888ea25c298---20694327304.pdfIn PDF document text
    • http://garderoba.sk/images/_file/jixomorasuvuziril.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea5176ca5---fovuzud.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4c68b9d2---lodaxoraxisuwav.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f407d539---57153285926.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gusovonakape.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6b88a8ee---sefukegelulutojumedofaj.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tusipixidonok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=blemish+skin+meaning+in+bengaliPDF 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_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 17724 bytes
SHA-256: bf53317112a2f10e57eff71ad4b8316b1902302fb56a6a0843948b203b37c965
font_01_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 10524 bytes
SHA-256: b0b05991104178ffbadaa160b30bde9601aa26294afa5df193490d9f4a1bc834
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1