Malicious PDF — malware analysis report

Static analysis result for SHA-256 9491eb5bf4cd90c6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 13:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9014bd3392d43f13843246cfae40d3a SHA-1: 7061580bb6add4a6ecb72159e0921800ac4a04b8 SHA-256: 9491eb5bf4cd90c6684ec148b5044fff8be1d42151ca65ba3c6f22f992de9be5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites likely serve as landing pages for phishing attempts or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4d15a696---24546998569.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9932e3ecb---rukepetudodogona.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bexixetokekufekif.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/nurebopuwuzowakuma.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/vumikatitekugirezotiwa.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///62983414975.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/pezovekizavesaz.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/81470273416.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5637a6d1be688ccfbe4f81d5093bf131/ropudiwosegegiwojuv.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/27419316566.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/gajinuvelazarutidiveviso.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s34eo4jamkkvh03hu13gnbcu0e/24125042955.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/af964eb640b02837ffa174fb50e9c701/92572087350.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r2pg7rkpimfd2otekt7cph5o9q/3961605262.pdfIn PDF document text
    • http://change4best.ru/upload/file/vupitoseranatawi.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/71929322937.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d3ae8e440---44510856907.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612121569abf0---86012254491.pdfIn PDF document text
    • http://iworking.vn/uploads/files/fimewafamiriligomikakili.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///63363854950.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/15669117144.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5cppjkt4bhg4usccaa55vfglf3/jejevelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=asking+direction+conversation+pdfPDF 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_off0000bb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4A 15612 bytes
SHA-256: 35ca78b9abc423df8ddbf82dc34f60aa67f9741727050f0ea111e4d987e388e9
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10888 bytes
SHA-256: 32825dd16a0cb5740c917751b9fc714b655c74e6e19b076cfcdb891450b2cfe8
font_02_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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