Malicious PDF — malware analysis report

Static analysis result for SHA-256 6251ca8a68cb31a1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 12:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d477141acfedc29c4a0a22ebc3ea000 SHA-1: 04d0b9cec32d61afb95917459414400cbbc03761 SHA-256: 6251ca8a68cb31a13fb67b3ca306e9474e174df801c92efb6147e794f23739b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this, as these are often used to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://olympusflights.com/files/files/37255637800.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e9tcn6ceu522jvfisdtjgfi6b3/fitanofonofivu.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/kasaluligavuguvo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1ab7c267---73205512844.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8gclrqq3f3susbsv4i4k8qhe1f/zuveti.pdfIn PDF document text
    • http://ore-processing.ru/d/files/motipa.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3d03503f0---86291985349.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9be1226b34ff3ef76606dc09f19cbb5a/70341607057.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4f3b898b9192f72ff5b41c90aa49506a/84733449638.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf836d90f0---felifetuju.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jl0qn5fodse7li1e5dfivno5fv/40039336269.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d750fbbc---11380209514.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3cb143e07---96705223338.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/24632979450.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/rokimixo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zoxidunogowezaku.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/jovavodadax.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b9709052c84b1328741e2f2f30526745/boderalelal.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/girubejuf.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/kimepaten.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/febufaza.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/xezexakikanotanabapo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c95ff4e6dc2---wezefuxedigakimipub.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759560ab6b9---35443468281.pdfIn PDF document text
    • http://tencanpowder.com/d/files/58765175135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=orbit+baby+g2+infant+car+seat+manualPDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 11056 bytes
SHA-256: 5ac4e744096c3ecd5931f450acc4d47d1f10a4dcf6125f486d03c2eca596f1e6
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 17420 bytes
SHA-256: 0c997f69b38eaf17076ad2e38a3e2888daa1f9fd6e45b345c79ce8b8f2c0b28f
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1