Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec3589d7094f46e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 13:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90f86dcbd7aaee822eb2b9adec326fe3 SHA-1: 3f403d46f90179a16e4bc89b3059035f10f9315f SHA-256: cec3589d7094f46e78afa35bd78d258784f29e357220020ceeeaaf9a377ea0e2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://abandassociates.com/ckfinder/userfiles/files/bibonomub.pdf In PDF document text
    • http://malagi.pl/user-files/fck/file/tumolis.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/zunojepipatusiziwaku.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8ee25972e621ac4ed284a400e3a53ece/fatagobudezut.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/b3b73560u0peomklqd9k22oens/145944778.pdfIn PDF document text
    • https://pindimana.in/uploads/file/17393935712.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g5mranlf8bocl34vegie13g6lp/sekuda.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb280081122---24925848702.pdfIn PDF document text
    • https://ahha.az/userfiles/file/66557200201.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/roxovawabiwame.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2c4c9969---wejifiruwugunabovupasu.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/domulogumuximosup.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/85701793071.pdfIn PDF document text
    • http://usmleworkout.com/files/file/netadogelidejejen.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/nipapegugekegiz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610eff3a93e0c---mebedorikajug.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c90bce1a481b52e512eb2ba19a1d5d4e/puxogedawozi.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/benam.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608182c3b7b8f---fakelutadezupu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/90867629279.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/tirulorodunesafipozigega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=computer+virus+pdf+notesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956b65f1212---7602124580.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 10648 bytes
SHA-256: e35fdf8c5318c0a47660a17dd8648b66abb84b1216f864036008013aa7c9f027
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 18104 bytes
SHA-256: 25f0e95e6026d352855d786fbc57eff23ed1b53a67cd570f26f5aa92cf48cd1d

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