Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dca3f3db4854bca…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 04:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 768fd442cdf7c5585a09cac4ea13e090 SHA-1: 44d9861460a46a063fc212b692cbac4037ea2b7f SHA-256: 1dca3f3db4854bca1c8c9b2a10f6df7aaae4280424d1728a8e785bbea4f869d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, as indicated by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=street+fighter+2+download+for+android PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b0c99f1---maxot.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/baxafoda.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/84512711748.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xozom.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/32879482738.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/67579517725.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210914112146.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/65053993293.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/1715813618.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/dorejozetesemiguwatubive.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vedawoxibisaporom.pdfIn PDF document text
    • http://kleiberit.ru/files/file/29457521209.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140378f989ba---zagudej.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/85939666758.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/wesipidizokezakofilop.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/75a4a012ea8704e3e357bcef30874ac7/pexibusigevef.pdfIn PDF document text
    • http://tzsunup.com/upload/biboliviraperorodosozivo.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/luzudejer.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/vigomimaxanizifatobuwe.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/vixinobu.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/38179748599.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/11552774032.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/100119344003.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///sovaruvo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614105b5ca959---82160575226.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_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 10744 bytes
SHA-256: 662c93ec48f2ec0975e237b9f786af80d7f3b727190c7257d09c7e5b4d94a239
font_01_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 17960 bytes
SHA-256: a789f4768847497bc0e86483a594c1f56345dc591e258584914dec44024e2ca1

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