Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85713a488b6d978…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 03:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1cda7760e350a9b1331fd90dbba2cdc SHA-1: 5bb202b61fe2ecef5fbcf36eeb950d6556340ba7 SHA-256: f85713a488b6d978b3dcb2fd012897aa191eca855734a0a41252bccb536d2097
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external websites, some of which are hosted on compromised CMS uploads, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://youngthisyear.com/ckfinder/userfiles/files/38951916927.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/71577950289.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pftm43tfdtf4887o471rsnhn66/32170334783.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/jasinatesirokoniz.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/30378051288.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/luviwevu.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/56362656269.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090814002449.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/5542483919.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc8ad96f3ef7c9c49c9ee4c106b678a6/wesavuxu.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/wolatipirozimukuwil.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/nekukiwuwukuvilatuvutotos.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/sujamujiwevog.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/74470614953.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/20305858586.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161362d5a7b16f---lonepulifuliruwawevobete.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nulewijidawezo.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/ramowujogibudefijinusi.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/xatukifutev.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/nixuxowetajuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dragon+ball+apk+offlinePDF 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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 18172 bytes
SHA-256: 831001f41a5b1ba838d6548ca0ae895807977a1780917884677d0c13c66acc71
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 10500 bytes
SHA-256: 6a26990d442a95d3175dafba399d3e420f0d267eca9447e2dfd842bea47f5998

Open this report in the interactive analyzer, or submit your own file for analysis.