Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9feaf46d3936766…

MALICIOUS

PDF

84.6 KB Created: 2021-10-11 01:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f82e019cad854b945cbdef650135042e SHA-1: 87c9c8b98946929546f91169121d58895eeb7c54 SHA-256: c9feaf46d3936766b7896c59d0cfb4df1c58790bc25eae527ce4b680ec6293dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nbc.com.vn/ckfinder/userfiles/files/zasegejiduzinedegegesuwe.pdf In PDF document text
    • https://arabadvertise.com/userfiles/files/43868895537.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/evgt6ot450glp4idd3vk264cck/bigidofebamivuliro.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/wotodupu.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/15664419509.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/40876526872.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/52461828652.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/7537491556.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/6f526910a74b4655feec803727c1f0f6/denabopagapotad.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///lumiwavozuw.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/34646241960.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b3055ec5a---jovaxidoxigas.pdfIn PDF document text
    • http://teresachild.com/upload/files/lusapodarugoduneturudos.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/416909d692ad9f4d6aa8f8600fee94e8/mananukitut.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/34874794944.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/wetipogerar.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/nugijitasomejelura.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/18606721011.pdfIn PDF document text
    • http://farmina.ru/uploads/files/49348288504.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/86457248291.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/56408867349.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/monajiridipigevijupod.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/jadupuzalamuxediraguzaziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dow+futures+livePDF 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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10196 bytes
SHA-256: 47dc65fedb5bc081153f938bb4296f8141917afa4cf3c7d10fb3b91e9eee1268
font_02_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 17416 bytes
SHA-256: 702d856f88da8970f84c8631b18ad4539a7aed873ea27a0c3663891cc3ece110