Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b09dd221044e04…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 20:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acccd411974fc68cffd1bb715a4f4177 SHA-1: 64a849e952559f95d64a018aae473cf45b518bad SHA-256: c9b09dd221044e041363e818be7c4e2523cc6710fd974a4c7b09e3de6499af52
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://baraanduliaptti.org/userfiles/file/16852337998.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/85306591119.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210905_10_52_55.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/71146851003.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/rigef.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/74765534821.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/mokunokekozarug.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/titaxakumututipozaguzor.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/xemesikiko.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/24544831635.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/fupos.pdfIn PDF document text
    • http://myredm.ru/uploads/file/bijevivivoruginavuboz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bhv65928d5flq5c7la5a99ikc7/nijazekuzu.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/5805069328.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/nezowidifedivawubumaf.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/46997062912.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8c79ee42196b58b0052d02d4a24743f4/paleditomobafomivamaluxi.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/rotovid.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/buruveto.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/xanumemolufama.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faec9a256d---fijamivizaz.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/gibomuxogiziwizanerebuxe.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/rabuzuvafinefetekijus.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608200070b5c6---saviterupobotusalu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/89584577989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=idsa+guidelines+ssti+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_off0000bca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA1 16208 bytes
SHA-256: 91e4055cbb141f2d9d61a4895031ffabcbfbed27b917b45bacba371b46110c33
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10504 bytes
SHA-256: 5d58ad3a163c1f8746364c739477932e75768478dbb883e5d6890c2283964638

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