Malicious PDF — malware analysis report

Static analysis result for SHA-256 9186216048501eca…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 03:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e7b26a48af5f00df7874bfdb0cca6d4 SHA-1: f9c2dbedd9be02eeb99319e889fa49cca0a47612 SHA-256: 9186216048501ecac34251781267b596f85f7bcb4b485cb87b2add7b3f6ca3af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

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 https://krisoc.ru/uplcv?utm_term=total+warfare+battletech+pdf PDF link annotation
    • http://ogcdc.org/uploads/ck_upload/files/36795579090.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbaaa76d2---62287899510.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/72514573300.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8745957e---pigijotuwizikebixifuzije.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_07E34F311D164DDB.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/81966098932.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614257b855f98---11925433650.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/duxaxalenufilepimu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/rimomowevuzinijaza.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/16288706893.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/34421928307.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/31649458063.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/78881914239.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/34102963240.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///92526427018.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/sonewide.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139972a4b658---73022699415.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/65850273256.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/lekejafemigojeselexu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/70665068f620fcb14bad285c0533bafb/bowevig.pdfIn PDF document text
    • http://briztravel.com/upload/files/47455888405.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/17469099327.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/dosizarilukofuriw.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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 18496 bytes
SHA-256: b5352adbdf6c2e8580f38b337fc74147ef2cb9fc5256a1c900ec14cbbe83ef2d
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10544 bytes
SHA-256: 1161f333423212812a7fb7bd64567e50493dfb924574941bd2367a21d6e3d40e
font_02_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1