Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6c0c21e2f1276e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-27 17:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c069c733f8ac89e3652020e7159b906e SHA-1: c682d1eac88db0ad13a59995cef8fd69c77b3b98 SHA-256: 3f6c0c21e2f1276ecdf6d615f17b824c43e2a0c813bb863259fa1974e10c7659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://shibbirs.com/media/files/85227536072.pdf In PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/19890774535.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0r2htp2t47mlprkmctcm7bpboe/siluxabogadi.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/volatezibijiwovefobores.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/shnhb2qenvbselbtj02hns14e6/niwefakaranivulogupuriri.pdfIn PDF document text
    • https://digireg.it/upload/gekow.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/41a1f90287fa4afacac2d52afc80554e/zibebowedivenebilud.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/vitomopafi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b36159abd1a---diduwojazabuxogowepebix.pdfIn PDF document text
    • http://www.moyekolodin.com/files/butefatujufadalunara.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/63250409949.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lixisanulireletox.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4409a6d07fe91cc0947b4ed224e21193/rorisaziseresozit.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/57986826529.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/luravokan.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/30300161879.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vonewaleketasafiwewinebi.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/jevuxopetuxapi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/poladuvexuwumuxera.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/90966916196.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h49170p8vs7ds7vth7otof0uh5/96020796404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+mp4+video+converter+activation+keyPDF 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_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 17168 bytes
SHA-256: 3269e937adcc01611d0e63734ec3a8c22857f56f4add3a1810a33083e26f6bac
font_01_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 10788 bytes
SHA-256: f88b08f854cec97c7978cd8d7e1bf49d17141404aad7057a8393067e66a417b3
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1