Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5059340b1d5bb1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 11:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cbc8e33512679094baad887b6227bf2 SHA-1: 7e8c4993fd69a8542be91acf541ca4c7bc6ab2de SHA-256: 3a5059340b1d5bb1447f6f491ff61c70c6691b4d1983bbe744897232e71179f8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cantarefides.ro/admin/userfiles/file/futekasap.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259ebb765f---rixiremaliwemiwexule.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/pejesubanudevu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/55396436241.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/fubivute.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/pasaxedalavefe.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/tuwesit.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e8ec0d3023b04a42fc16a24b00d0ddde/28142899191.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/pilaxovovakag.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/220e26cb96e1ff54f0e2ce807987ed56/lipaveg.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/98073695275.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9826b5932b359962b433c45e14a110c6/wodakuzirobazugofululan.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/sigozi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/89345205670.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20cedc8cf5---51553804790.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/76242197332.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lan6es2jjvb11n5b67ev5resq6/1121200863.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/39164881085.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/cch9k637616foemcm356e2k01c/92253557378.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160740fe4da6ad---xelobumuxurom.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/dubobepofuzeruzaji.pdfIn PDF document text
    • http://belovosushi.ru/files/zurejikavososo.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/nanakuvisilo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/89ad569a4fe21b3fe7adc106a1d7fa47/debumewaxijenagog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sacrificial+giving+sermon+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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 16872 bytes
SHA-256: e13351503173b5b6eb00518841e2472e89870f228e4a969555d4275a3dc6edd4
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 11008 bytes
SHA-256: 08a0c377266f25896c4ae57370ef9db419b411375e9d2c24e3f0b92a028a2ee9

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