Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8797ccc0bb5e1…

MALICIOUS

PDF

97.7 KB Created: 2021-07-05 18:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f18860f1949151449efd595659b6940 SHA-1: 83cb5ec79d62bdce778d6351a7912e4bd916da46 SHA-256: f8d8797ccc0bb5e1ffe5017b5e785e28fe3c6022a04bc003027920dd9cfadfbd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or further stages of an attack. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837f716a7fb---10396559113.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215121328581954.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7aec8c2bda1e0a10899f6249562214a6/garutitodenolov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160955c9c2a2a5---gagapimukavotutevevejuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816b98e2073---65497374284.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/voluvebawi.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/fugulusonuzironefurin.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160859392842ae---59293827601.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/tagonapi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a775c4343dd---tadofivobagudol.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/73503117dd3cf06b3b96ecb849f8507a/68401792952.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608706ac22e8f---saposuzeberugunedisiz.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3cf5cr413t2dk927qt2erg9cr9/4142685320.pdfIn PDF document text
    • http://fabtur.ru/upload/files/desiwerenadovafa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0a705f1b74b58e652e08222896615b9f/60227780491.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c748ebf7e---72734874242.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623205343.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf28efe82f1---jimegujevivoli.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a764ae5f59---75360267565.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/86823969584.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/30397728679.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v062mjqbu40kn265kj9srhtic4/12911184468.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/57478300787.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fa2ed98bcdc918d9116780c38efe0fd7/xesupelivak.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cba25080---97021797720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=faneuil+hall+and+quincy+marketPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10776 bytes
SHA-256: cd6bcec3c87fd4b138dee507881dbbec1bae055a0a6f33825dd9c52ec9071da9
font_01_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 3080 bytes
SHA-256: e59a321cf7a2deee642868fcadf1c28d75df5d5432a6694c91531098d1f729a7
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 18172 bytes
SHA-256: 2aa1eadd0c90359a0afc3d4ea4da8e13b275b44654080dfbc60b1f26792a40e2
font_03_sfnt_off00015f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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