Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7a10b843b4453a…

MALICIOUS

PDF

89.7 KB Created: 2021-07-16 22:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bdd0f9c941c7bca8c44a4b5d85c6c1a SHA-1: 432e720578c86bc811656de8bfc17962c59ecaa1 SHA-256: 8d7a10b843b4453a29f5dd32344838d3fcf49e9aedcc7b03656c27c8b3b5dfc0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. The file likely serves as a lure to redirect users to other malicious documents hosted on these compromised sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/41p5m3fosf0ak05vua7ine122c/xobefuj.pdf In PDF document text
    • http://gld-lining.com/user_img/files/zezexesulidovibukigip.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ec4df65416e57d5c15e824cb9cdf6014/23849230023.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1llau10cqnchlvpggnbfo359cv/32412851223.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/52291087743.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6fdcc8777f8050a95cfffda57d197c13/97600081181.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fozejukokotamogugudenuzow.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01131c065a---45768499891.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qgmo19rs9hnk90lroei1iums44/xusowewuwefulunugavigagaj.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/rikadesezebevakifasedaki.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/lomirusumirar.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ecdd0e0c78149624b52675155db27dc9/kebub.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/60474826648.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/xajizenirapawobilosebip.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/e9he8iccmmg9m223b0kfvuamm6/40960742577.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/sazujemakaferivafaluxo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kopevavaxejafipizemavuk.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/kunidakaxef.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095813b182b8---30695651744.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/55621828842.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fodubowosababinaxexi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/83452708305.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882d8f67465---xaparaxajedezerelajorofov.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/8277836147.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c62c2412---65122545185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=having+an+obsessive+personalityPDF 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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 17668 bytes
SHA-256: 5dbe5f419667a145b2799cdb204a7427fdcc426277298de4b7821e15628f0488
font_01_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 10736 bytes
SHA-256: 4b42e98e11de59bac9e9b45b9dd65428a9a1717aa50e459f1e501873d364f6cd
font_02_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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