Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a70d42842abb5da…

MALICIOUS

PDF

75.9 KB Created: 2021-07-01 12:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f9bfa906c260e5db1edf9cf2b6ab1c2 SHA-1: 117bffef6eecc748c3b280adeb75e3a9406bba8b SHA-256: 6a70d42842abb5da5a1657d6e8859b51fa810eb524e466f81f875be3c9a1e653
156 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 functions as a link farm, presenting numerous URLs that point to other PDF files hosted on compromised websites, likely to distribute further malware or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=resident+and+non+resident+in+income+tax
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/58nje5gl5jno8sd939chdd1p3p/87697772897.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/72417065210.pdf
    • http://wf515345.tw/CKEdit/upload/files/62570644006.pdf
    • https://steklo-shik.ru/userfiles/file/bosodixewuribemofa.pdf
    • http://ac-kenigsberg.ru/files/file/mageruri.pdf
    • https://cleanenergy.mn/uploads/files/66659514088.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5c4cbe6b758d58c6f5c9caeef1cf880d/tevakugatel.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607428bc0d505---84513674678.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/omrvlree3tp9827eo9kr3ce930/zofolixogimotun.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc16de7929---tokebekipomoguvizutawid.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/af3b0e76d8460f910fe62ee873640f3a/2012368796.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2o47fr3tj4kvqtuas4eoeffbtt/sufudokosoxigaj.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e368250f2a---kemevevilarisub.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8942f5c8fef9c44c4e1d808c5c55d039/pememinelegadasam.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2de5a633dc83e24b227791face42d550/romemadegiwi.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/lor2btuajc0k0knpqgm9vh112a/21777070606.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1155f152ad9c1fd875ecb1c0e97e49d5/17625885478.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/07aa3b7a44d667e8d41b9a9d8000f505/27542624068.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eda0c9dc5---reditaf.pdf
    • http://eraucheta.ru/uploads/file/kuburetifujevirozibezakib.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/jebabulafegamosa.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a53e24299---99872130758.pdf
    • http://aa-nusd.jp/21882100953.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78a.bin
c33e2655161a6b115b0c3d99b208111fb44db676ba30ffbbb064d37812f90d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 10632 bytes
font_01_sfnt_off0000dfe3.bin
34b0ec4957a8a0ee20cc9fda6fc9a56fb5b4de14537f818575e8a92fc4c77aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16552 bytes
font_02_sfnt_off00010ab9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 16792 bytes

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