Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1b198b9f273539…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 20:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f330021a4b1ad188aa21a158d76adc9 SHA-1: 3c3da61722d9abf006aaee60cdad92e8b8a2db50 SHA-256: 2d1b198b9f273539cc3ed790854bd4f55be189efd048d4129de57a49e39d900b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bright-mineral.com/uploadfile/file/2021052721570249.pdf In PDF document text
    • http://crmloccitanecr.com/campannas/file/ruperofujudogixisojetufu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/45932723510.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607619d0946fd---wusafavebe.pdfIn PDF document text
    • https://agatanorek.com/files/file/tiludabuwizira.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b71409f039e---vafapuwurafafujekoluravut.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n4bh4pjmioha1ahdafph3f7g86/28952108515.pdfIn PDF document text
    • http://kodemari.info/data/files/74402853861.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/37a18fddadfedc366e444806c686a077/kubutixotitu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608158eb2dbfa---446580651.pdfIn PDF document text
    • http://flomojapan.com/upload/files/8209388450.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ce2e2f1af---82684344775.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/264f1e4a2d114040e362993b04730a86/27685046645.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f61c261be4a---84066319565.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5ed43beeadc8de76cfdb485428077ef3/zifuvituda.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/78566154684.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/30672341228.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11467714769.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/87730957056.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/mokezitozawepunoz.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107210847191395.pdfIn PDF document text
    • http://cssh.es/img/file/9743904439.pdfIn PDF document text
    • http://budropol.de/Upload/file/guxaxorore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+refrigerator+rf25hmedbsr+repair+manualPDF 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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 19856 bytes
SHA-256: 9de45a652d859988acc924b388f28aec06f08138be038db31e01ca95bb523f60
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 11516 bytes
SHA-256: d61cbc67d428ab06be78a308dcb66bb7d537b34f827ff295692e5afc129f5a6d
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1