Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe2473a68fd02fd…

MALICIOUS

PDF

87.9 KB Created: 2021-07-16 22:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0bccc761b71578015fef613e07791c8 SHA-1: aae44cea53885536a3d37782c8c265aa3d976ae6 SHA-256: afe2473a68fd02fdf1e6933278da53ca4764d46def5b887b2319515d7c4e3c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc23a2da85---48763182077.pdf In PDF document text
    • http://lnshiyue.com/userfiles/file/20210623012502_383141473.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/roset.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/ruduxige.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/079b891d1cbcd7356e70c247f044d803/biliketofobotekenob.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4b47c7c55b48312b60e68fd0e235b5e/judotekisagatogok.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0e4d9fad15f674d4981274ee2de1e96c/18931026008.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tndjb2h1hh3d1qi1o63f8oiha4/dezeku.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pvdlc6r9ehsft7pk9mosjqfr1h/79693930484.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/84234258157.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/togazu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b8fce40db023129719055de6fd2bb195/48846446596.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sch4uhmikveh07u48p7nv1647q/foluxojudetezatisomumo.pdfIn PDF document text
    • https://businesslife.com/content/file/fajetadenoniwugi.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/35842062712.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/007904925c390971c4947e2afdc3e593/jivile.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c2aca299fc3607d8b8a4939af3a0308f/vekaworelitowesavorazojal.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/58483768400.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6604aab0---82217233634.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/timudadobojoziri.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/45641407531.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210601112551.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37c3e99fc---11264207782.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/ferowebaxitapubujixomajag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mark+up+meaning+in+accountingPDF 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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 10688 bytes
SHA-256: 16bcf3ecf3609029837581b90f2eb00076858d16a2809f196356008a4f07c99a
font_02_sfnt_off000123d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 17696 bytes
SHA-256: f72c5c86fc91933a9da771d56333552943d4313c6fad72262a9e5bd59a3e3b53