Malicious PDF — malware analysis report

Static analysis result for SHA-256 c624741920b3a74f…

MALICIOUS

PDF

112.3 KB Created: 2021-06-29 02:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9aef200277619d0eb4cbc1890a551f76 SHA-1: cd5f22115f6720b04304210782aa490c42467d13 SHA-256: c624741920b3a74f3493aae1eaf2b8124a504aeeba5e2d1aa353b958ededc3c3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8adf8b9731---35909513170.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c2f35fe070caf2b8ef3c5f3d8e326b79/jonebuxudivo.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/31373819364.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a8fba4e144f756b520808e25ba7049c4/fawopadaxikonulutirufoni.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb94b8e81---10005444513.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/97228015464.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7183375192---webofofoxopajumipaninuxa.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b58f639d2---17838564460.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20230284953.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607203cd16628---repurukajuref.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wivelanavizak.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/datonidajalebax.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/10750b42ddb1d9c178466822bbc5d273/44339339141.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/3433601566.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/54f7320d8154f305872e4e959efdbd18/tuzezizipamivebojuwuweze.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ae3e5f6cd96036eab44aafbe4f9c3c16/fafejexilokutotadubawujeg.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9ba48522---libexosukuked.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaee8c6c91---49189851283.pdfIn PDF document text
    • http://merwepizza.com/upload/file/1200348356.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vosejejivoxevu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0d08bc77---xazobetiv.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b612b679---49728137778.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b133a5c4b---xabozi.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/koxevusamujewebul.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/27541532590.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/dubonawijup.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d34630c7---42062445109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+scarecrow+song+ocarina+of+timePDF 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_off000153d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE7 17780 bytes
SHA-256: f879863284cf9f8dbb41cbfbd11d05c59e1ae92a76065a4813c19e82732483d6
font_02_sfnt_off00019ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ADA 10784 bytes
SHA-256: 752dfb0f51e4f7a73b3ad8cb51150f8cb7e8a2c0ba10614c732aa2e5a9012fc6

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