Malicious PDF — malware analysis report

Static analysis result for SHA-256 9244a7dacc69307e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 20:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 567df5bb417793868743149bcf68757a SHA-1: dd1e626498f3f8b634f19b7a3f683470d5f366ce SHA-256: 9244a7dacc69307e64dc37af558bcfd2a62d57f35f919a38d9c64cf0d384a7e6
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to prompt the user to install malicious browser extensions or updates. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, likely serving as landing pages or download sources for further malicious activity.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://krisoc.ru/uplcv?utm_term=amharic+to+english PDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/daxuvurujisak.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/90051075153.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/8152203934.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/buvosomumamivupigeto.pdfIn PDF document text
    • http://wmsone.com/eimages/file/8743291375.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/kexogozumabe.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ubj1h8gq4oupq2j0b7dkr5c3p0/javowiwidagis.pdfIn PDF document text
    • http://innotack.com/userfiles/files/39342779140.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/wefipifatuvezisobazi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0990127f---16738424511.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nijupoxi.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/visepofejewujetarej.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210920_071954_186.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b54922cea---sumekaropedefomuxidusaxij.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/21101534734.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/pukurodixepenatod.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/55530607578.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/28990610223.pdfIn PDF document text
    • http://precisao.net/files/files/bolefusu.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/34087482940.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/libipanaxuxepenar.pdfIn PDF document text
    • http://devison-matras.com/upload/file/61832897912.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/fivowi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/tumuniriwazikawosalaxug.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_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10660 bytes
SHA-256: fd40ea52b502793d4e67ddc68964985d9f38553a75b2d23646b36d5dc0069481
font_02_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 17584 bytes
SHA-256: c4bb64a78ff386c7693536f87aec4cdeecb0dbf39052358506cee9b81ce761a2

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