Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c5435ca0ddd678…

MALICIOUS

PDF

71.6 KB Created: 2021-07-07 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfc4c78c9fad9fa908840b741dabbbb6 SHA-1: c356217e5c884ac62f8dbf044b66964fabd1dfc4 SHA-256: 76c5435ca0ddd678f57ef14da7fd30ec2a15746a7098e1f3fc135756fc2bab3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting suggest a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and the URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=export+html+table+to+pdf+in+javascript PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8ff30ff9deb18959cb091e7c9330b5bb/tesujuzigajupirakovuv.pdfIn PDF document text
    • http://inse.us/uploads/images//files/bibuledew.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/65400027393.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b130d2e984c---23442659791.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/vunaxenitugix.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/823dc4650dfa7ce7edf4aa301706a8de/93543414440.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/sudebemiwor.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6978e1dd---zorewuwe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57572586fe---68004117037.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/31212169670.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffe1f3e64d---nikosegewipumiruxideso.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/dopufivetolugofox.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2f7db0f7932f8b9b633de0f78ab7457/riposodurajo.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xoraxuvexanid.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d955023fde7---polekorodokaki.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607506888d48d---gegira.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/64780603220.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acbd629d7---28949545840.pdfIn PDF document text
    • http://nessium.net/userfiles/file/foxogaxemoremipasi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d9562f0e---dezitufisobol.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/fijekekom.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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 16884 bytes
SHA-256: 286c83354d9fae09bdc938dc95bf20ff8846a3161310d6f506de7dcb10c6e3ab
font_02_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 11308 bytes
SHA-256: 62a145af4860e671eee4f42f81a05735432f5be83c7aeeddeaa3ab796ac89390

Open this report in the interactive analyzer, or submit your own file for analysis.