Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a960660e07b5d55…

MALICIOUS

PDF

75.4 KB Created: 2021-07-03 14:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bc1317e8e2843c17834025933293921a SHA-1: 5b47d2c869370b8953f2158ced3b073990d81270 SHA-256: 6a960660e07b5d55a1ce8dd1fb5b3320137601c40084209385b5378a541e3c0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://caratow.eu/userfiles/file/runimun.pdf In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5cb81917abab7c8624496cac68715e87/mufegerifekuvu.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/zoxumuwisevusamujuboje.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/52914495402.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/bepaxej.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6adfa966ffbf1689f26dc54e55ac7b64/83130937732.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/249ef9690021b3380a5cf2485fdf3b47/78527512690.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/71344087848.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/tikikureserijaxi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608303af44792---sisazidoku.pdfIn PDF document text
    • https://saam.vn/images/content/file/tasitenelodenop.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/xedif.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jdgt7capaii47nkqlqb97qb832/fazobotevapejigubivume.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d464047b10997dff90e5a1982e8c9110/10155376054.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/23702957165.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927fb35de2---62492519188.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/pizizivikinepexot.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e7bf17bf---44511298436.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607340c7ab2ed---46030340763.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/rudujejogolodu.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/36890321657.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69ada6d03---wopele.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/28922951604.pdfIn PDF document text
    • http://afro-safari.com/upload/files/34955804696.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86d504eda---rajapefomavisigozeko.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32a54cce72---23324333175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=modern+physics+by+g+aruldhas+and+p+rajagopal+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B6 11364 bytes
SHA-256: c6df920ab833bf7b21adb0403fcf388b90f31268c33998bb5809ea3fd90ba0e6
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 15780 bytes
SHA-256: a647248c94c47cf71af80905582bd4f8b10d18868f114c64feb773070b660746
font_02_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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