Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e40a64799d83b3…

MALICIOUS

PDF

84.4 KB Created: 2021-08-11 14:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cb7a99145f908094ccd5a236b0e6208 SHA-1: 701ec8c3a6e2b08cd1466d6b3da087fb447710e1 SHA-256: 12e40a64799d83b3064fde94a2072bc0daeef08fde08867a8b1177886d61ac88
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document is designed to trick users into believing their bank details or payment instructions have changed, likely leading to financial fraud. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=huntington+bank+online+account+opening', further support this by directing users to pages related to bank accounts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://chcial.ru/uplcv?utm_term=huntington+bank+online+account+opening PDF link annotation
    • http://www.look4job.gr/images/_user_na/file/nolunofojemekurugewo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f4e57959cfc7e28cbf31994c475b30ff/72428195627.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zurudomipumubovunixa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3be27e3ea0d92e1c233e0abf8fc88bc/64783423227.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cfd5000f7538ddc1036800696408db43/xigesob.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/74745160053.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/diberas.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087202141922---fofupaxipoj.pdfIn PDF document text
    • http://aurora-c.jp/files/files/subisazof.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/93194879451.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e502117d---tilivomoxobimewejumuzutuj.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/gukujodemovamorud.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/namokonu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/90772271937.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/miwujezin.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/k8s2gdk8hskipso016ldq95q74/bebaxunofifin.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gitce30quu4ff7n8o8iufnp5dd/41158711447.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032c54898c---44737013720.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pekalobinebewe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224ba6e8fe---22854274584.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/vepolisixegekomu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eegauufhfjs7iefli4psog91c4/97311691684.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zovokemapexovalivujokop.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/69vjbsg6ls2kre2emglvcq5d5p/xirozelimibupalenob.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/zesekosaxojisusi.pdfIn PDF document text
    • 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_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 17420 bytes
SHA-256: bff37eea74cf75675db74f978c28e9442e1af7cf24f9c2f440ee91a5e41f3546
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 10604 bytes
SHA-256: 4152c1756e8d0d303f0fb26ebe1c4f05e07000b8806ad4e2a84237ba8e923bea

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