Malicious PDF — malware analysis report

Static analysis result for SHA-256 f366e7f1dfb02e91…

MALICIOUS

PDF

87.9 KB Created: 2021-07-29 17:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bee59a0b6b283772a1fc4502ad123d8f SHA-1: 1f22fc07bfef728361179b8ae2c752f125a6e749 SHA-256: f366e7f1dfb02e913570d77562d651fa0cfc82ae7ceea799a84e3241a5ccd961
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+download+nfs+underground+2+for+pc+highly+compressed PDF link annotation
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9bae30615c29c9d02ebd715d1fb4432d/31662331467.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3c6t90qk354dp1ntj2rnll74sd/57808273580.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/62p5ublorcisff4bv8hqp1vj3e/83932414091.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ipa0fp3n770evpv43b6qhpbeu7/36174801847.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/fugewo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/54074930687.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/lipujisum.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/25846084640.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/rusewibuvinalofezuxudewo.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/66909523415.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb29bd01e6---67137989290.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85d9a059f0---77604576734.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/94717967303.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/25818909633.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vunqfgkleu98hoe1hgaj1vbpu4/7986584795.pdfIn PDF document text
    • http://effektfilm.de/files/file/minatuxisuruzo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bcf58b6f8c8---38914283612.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/830b7e91b14dea04aaaff5d89afe43f0/76663681150.pdfIn PDF document text
    • https://actorconseil.com/files/file/zemavetajanijapewixi.pdfIn PDF document text
    • http://yongqingtech.com/d/files/15134885950.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b1fa181d---34179615465.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084694288690---76631885473.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tunasipefan.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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 11476 bytes
SHA-256: e0c42816fb656cfc88af13f8b5106024e5e464ef055ca37ff5a49348c1bcaa68
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 17440 bytes
SHA-256: a526a17b331ac808a64ebb74230af4e5477a360763ba271147e4ed11ffd736d0

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