Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaaceccf6b05e5c…

MALICIOUS

PDF

114.9 KB Created: 2021-09-04 06:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d5756c736b64eabe344ed6a80b04e5c SHA-1: 3b2d5ebb8ea2e4b6a714f4632677ca35a20dd57f SHA-256: daaaceccf6b05e5cffd50d976f4ec4ae00c7a1b8c3fe0bb6f9799d03e91f1b58
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. The file contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting and the use of UTM parameters further support the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=sql+commands+in+oracle+pdf PDF link annotation
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/nuzewofirigediteve.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/61514621223.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdb8d9a66---vusexizaza.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/66822480516.pdfIn PDF document text
    • http://hk-keber.de/images/file/13485324515.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238f062d0c9---sufukosewefijegofinovudu.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/woxofovadagip.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/jarezabifidobori.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0603/0c87a14d8b6d379bffcbce87b74f8235.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2f8078832008cee64cbd8119215d87e8/matobejedu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c8fe15aec---52556868188.pdfIn PDF document text
    • http://koronowskasm.pl/file/ninozukaxo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/40367701714.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/domibawodovaxezemexen.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/69777990935.pdfIn PDF document text
    • http://seamacros.com/upload/file/zuxorezutoken.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/22578343596.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bigabi.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/diwefubulozoxufuzewol.pdfIn PDF document text
    • http://rideco.hu/upload/file/nofarizurokufotanur.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/zidobemowi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f3t9p3fpvq75i5kpcf4jldgoog/malaxemojem.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/65663581867.pdfIn PDF document text
    • http://dalaichau.com/files/gepefopor.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/390d066d7b83d6fad1bac811ea4e78cd/97233655174.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/74891101fa82bcaee3b6e4a4435d314f/widazikano.pdfIn PDF document text
    • 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_off00015cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCA 10904 bytes
SHA-256: 868437636a0c5664dae54461e84a33ad03f560fedfddae6cb17765f1aa32731d
font_01_sfnt_off000175bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DCE 18600 bytes
SHA-256: 94b9c6d8ef28f05e7b70ae833ac5713bd62ad189e90afc2fe871f6ad1f5c5ee7

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