Malicious PDF — malware analysis report

Static analysis result for SHA-256 128867054fcd8203…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 12:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97c5620f561c226179af9019ac662369 SHA-1: 51b41087eb4be06893733f42d8be0fcf462a2b1c SHA-256: 128867054fcd8203388414a9be6b6414ce2b546553a5055bb7ce7ca6fb42f039
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://xnucleus.com/members/member_images/files/fabazuxaxarogikuparuja.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/aa83122718ad36ec6188bba3ffa5e2ed/tupidapena.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/fuvidijepaxuresege.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/vepunetaxuvesejujifatav.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614197cf1531a---92995869077.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/16853161703.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kotarobokowutorelaromoda.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613189d7b6e6d---12476194911.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/sixixogifakotafufugif.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/93292026050.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/74386364763.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/69527553404.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109151655261606.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091019225140.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/90f19698a2f0d7e5b7c7f7b1e38e2707/96892084609.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2f598885---jojopudakijosipoditijowi.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/65187474008.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/67086105010.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/25318332825.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/79787661132.pdfIn PDF document text
    • http://willbramephotography.com/sigaxowojedu.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/kexigevorelapazetusuw.pdfIn PDF document text
    • http://nensi.si/upload/file/22791198150.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/66377460528.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/kovomanafek.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pokidobuvuxepelijogavuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=supernatural+season+6+french+mistakePDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 11180 bytes
SHA-256: 3ed835d70a57c75cd54ad091f87d57edf48cc991a8e57367ceb59fb06a1d03fa
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 17708 bytes
SHA-256: 7b09de6ed1f6ff78d6f6f421d8c87b0b2ff1b36381fc79efc807fb53265d2f28