Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca15ee02f914689d…

MALICIOUS

PDF

101.5 KB Created: 2021-09-23 00:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b505be1149a464cdfbc06340f1213ab SHA-1: 2c5aa9b9953ed8e840561ccfc96a21b913ffd59b SHA-256: ca15ee02f914689d336bbb86c5ba40c81f0d953edd5937137e9ba209067eaef5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. ClamAV detected this file as a phishing trojan. The embedded URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2425

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maybaobidinhdinh.com/upload/files/kabisobamemiporubemilexe.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bbc1fa82---nogijewujesozejupifo.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/kiwotikilenerutiwufiba.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eci66qico3unnvt3q8g6q1ln8l/sotoli.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lawakumunodovirowasur.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/20687796505.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/bisidodefebomoniriwog.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/legezavozatoleva.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/bewutuxuxa.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909093308.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/89201049868.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xixali.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wevoxepaxiwe.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/lisolubefovabisorakamafu.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/kegis.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/45090976794.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/bunemuxazoxedapinavi.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/pulezesetenikus.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b27363e---4760615951.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/6300098133.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/57803683228.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/32753670053.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/12406664487.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vavidenajademunutavubimin.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/ninewoteweg.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nfoil748igas6llj70ktuqp8m8/sodetovubufovefenelizev.pdfIn PDF document text
    • http://gyliver.ru/files/files/55839449551.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/lefovomus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=simplified+square+root+of+48PDF link annotation
    • 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_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14762 11160 bytes
SHA-256: 3fa0549b2548201fcf7dcdb892d41fc2a83f8acd6cb67974e324f6ceeb56a016
font_02_sfnt_off0001614b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614B 20120 bytes
SHA-256: fe27ce2595b407c278baaf6b1f89426f247a0dc6b277aafb1d2cb3d83e342e24