Malicious PDF — malware analysis report

Static analysis result for SHA-256 c637495a0dfeb719…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 03:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3205b52d02bf825a679c026385bf54d7 SHA-1: fa1bd8f8690ad53d796c88a9c4cc890d87a9cc39 SHA-256: c637495a0dfeb7193d812fc806e276db8e45fea7fe3de269853d5c1fdac2b11d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the final malicious destination by using a large number of intermediary links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=ftp+to+firestick PDF link annotation
    • http://korealabels.com/ckfinder/userfiles/files/21941287896.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/56361081824.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148f094527cf---joropiximusubo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/44344822631.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/zokuwagijodiluzobomovu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/pupijemiburizep.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/sefamegofidukogizovarozas.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0d506dec---segepitinomumoz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16150450a0b487---98984750879.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/517b0d5a66286491ad8cba38441941ae/sowipomamigetibofa.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/solaj.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/18569795970.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/nixogetokoxegewasija.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/70195352630.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gibifejamasifalilexo.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/43671356668.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d13bd37bdbde87e66c61ec6b024a41c7/bedijopufazarifirotela.pdfIn PDF document text
    • https://network-italia.com/file/kifotowiwoleteg.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/mixafezefixavezomoram.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_124412.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/tuvelakubotimalirakexej.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/tilizitezikebi.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090910532291759.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/66771149455.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5fdb2307---31954939208.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ec356b0f2---sifaguzunosafanidikikit.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_off0000b30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30E 15940 bytes
SHA-256: 46f2f8ace6a19347dc957d255b821083b5e6217967657a3a79856603149f7ae3
font_01_sfnt_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 10228 bytes
SHA-256: 78400a439be184ebad599e96f3006fea2c07abb5563adec47fda125ea6092907

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