Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1c64f4d27822d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 13:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b3fdaa581f5068f18784628c8ee1549 SHA-1: 0b9d4c71e7508fdfb701b9e4e1c5d306de12aaa4 SHA-256: e9f1c64f4d27822dedcdfee22f4a1a01e37d72e52863931c0c8b14f64d119e32
176 Risk Score

Malware Insights

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

The PDF contains multiple embedded URIs, several of which point to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, including one using an IP address, suggests the document functions as a link farm to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sky1981.com/asset/uploads/files/xudidapegugasaxebukox.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/xolujagapujulit.pdf
    • http://brenderup.ro/mm/file/97502276511.pdf
    • http://lt101shop.com/userfiles/files/89205284619.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/22272058884.pdf
    • http://puginternational.com/ckfinder/userfiles/files/wevisewesofapogoloxasosor.pdf
    • http://belly.bpv.su/content/files/files/56215402357.pdf
    • https://huangs.tw/uploads/files/202109110513373861.pdf
    • https://blnk.eu/userfiles/files/gotit.pdf
    • http://dentherapia.hu/files/file/rebidinam.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af5da390f---87340497961.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/64199363862.pdf
    • http://ch-bovi.com/upload/files/10470831733.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/76ef83586551627ca22e74821ed7be7e/jijorap.pdf
    • http://struttur-arch.it/userfiles/files/dasexugapaxosidew.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac1185ab---60284638599.pdf
    • http://rklatex.com/userfiles/file/sawugiloxobunakisogu.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/51010156903.pdf
    • https://qatarsecurityservices.com/public_html/userfiles/file/98740307389.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e5dc0537---vawipoxeminaduloxofobu.pdf
    • https://dom4m.de/userfiles/files/52071951874.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/71453341923.pdf
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/54084675710.pdf
    • http://acunambalaj.com/adenoto/upload/files/datujoxajuxonom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ball+too+far+back+in+stance
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f169.bin
952383743f012c70b0f271709ece06026867d50b91d172c6633835c76942d78d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 10616 bytes
font_01_sfnt_off000109de.bin
f52ad376eba572beb7e02d0371b317225889d9b9ddaccef9cc2dca1a6e02047d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 17660 bytes
font_02_sfnt_off00013726.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13726 16792 bytes