Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cbdcdd0d3fef31…

MALICIOUS

PDF

82.5 KB Created: 2021-10-10 20:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1be47e2601fb8069d4eab4326001aa5 SHA-1: 6599aab4292697d56dc69fdcde43a83c617ee01c SHA-256: 85cbdcdd0d3fef317c2d2309f9d3ce8dac0b94596f491adb7f90f10d2105065b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress and other disposable domains. This suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pasarantogel2.com/contents/files/jovegunufomibo.pdf In PDF document text
    • https://castel.ro/userfiles/file/56513441755.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/miwokavozalofakafaxex.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616057bc22fe1---47962422065.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161544a55ea35a---kuralagigemuvunopa.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/julobexoluradexabotevugo.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/mapivisowufowuzeragobut.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161626753eb8db---56587627812.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/kuduzax.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/vuwidiremuzerafewejigazi.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/41849557147.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/selosober.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/12452759418.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/55382832048.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/ralewe.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nuvuvunebowozi.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/23410499322.pdfIn PDF document text
    • http://mfcpavpos.ru/file/82212538968.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/fdmc06arld8p4o5trn67s72tbu/tawalofetenimijozof.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/jadud.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/71163748587.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/tukibusuna.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/20065057909.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/76254683430.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/768347780f9db2125eda0f9fe09b4608/2284045167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=legends+of+the+fallPDF 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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10400 bytes
SHA-256: bcaca93495f25d054fef36285cf134fd08afc6d9d8a79bc3799a96b82ec7125a
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 17816 bytes
SHA-256: f2c26257540f649058638662fbae243977e19d062fdc3f6beb2f48ec511f4efb

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