Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd95575482215c1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 19:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3517372ae484d4ece33c7cd2665ea5d4 SHA-1: ef50e09be40fa40e0e7443ca688b2e245f5d6f19 SHA-256: 6dd95575482215c1d94996fa87a0af1a6ae4ee0c03b4d57c5246a7a355c6720f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://puginternational.com/ckfinder/userfiles/files/tabilasakon.pdf In PDF document text
    • https://illustrations.noche.fr/images/files/vifegijanabapoxidafiwi.pdfIn PDF document text
    • https://partnermind.cz/images/files/feduwawarukuveril.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/pajorojixovinunatetitiso.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2eda477b2---lonoseboxa.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/kumixalidu.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/foredotas.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_E3D92084276AC481.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hpps63sar0boimutid6gd4tsfm/gefizitop.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jutepefalovezetisujo.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/gojabiwidumimuwoteziwunaj.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109072315173802.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/26169836816.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109031937372856.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/webetikepogit.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/lazefuz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a0k3oqohp3omjpoeua5a9bcghg/8194403652.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/14744072330.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25d363e87---83132523969.pdfIn PDF document text
    • http://momsystem.ru/public/file/82103969171.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/25181435007.pdfIn PDF document text
    • https://bfull.ru/uploads/files/43805187415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=green+pacman+ghostPDF 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_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 17868 bytes
SHA-256: 5e463f97838f785d851ee2915cff2af2e1d1676da0c6f3831006ce5e01c5a3e7
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10720 bytes
SHA-256: 0a44713cc2c94370dba110d4765319da834ae7fa1bae49aab88ba051b9eb2d68
font_02_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1