Malicious PDF — malware analysis report

Static analysis result for SHA-256 307dc0a153fc21b8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 06:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3097bba33a8feac709360eaf979bc59e SHA-1: 3617d0f2cd97ecd1665b119505f25fd6ee11fd88 SHA-256: 307dc0a153fc21b8b2553dd390bd0d5327eea1b8f246ba513b05693303801e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 https://wastran.ru/uplcv?utm_term=how+to+cast+mobile+screen+on+tv+without+chromecast PDF link annotation
    • https://www.nstoplana.rs/ckfinder/userfiles/files/12478939955.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/92124277764.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/caea7uj4r33umno7bej6559e2r/ropakod.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/muwepolir.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613263c04669c---15669066620.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/19379968843.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/gexokek.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/49717236097.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6dddeced3---14566944223.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/37750385065.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/96942300347.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/44616743710.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a4ad5b11dc69e65a0a11d99c4e4eb6e1/rajirifemota.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a7fba06e8a2f217140b85a0f3f917e7b/67018878932.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/dilodewunavesifufuvek.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/xuxodivizigumuxibup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jikixovet.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/ferijejoruburuvepejofiz.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/89259956274.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12420801372.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff9f468b1---nipumilodukejugexidik.pdfIn PDF document text
    • http://handgun.ee/media/file/70347212370.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l51c58v733v5phcb92rr3jvah3/zomizurag.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/70823978515.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 17292 bytes
SHA-256: 7f915d8c7ae46aba3c2f2352f7a0f21da11f97f04dd9ac01b9ea8e72e3664e0b
font_01_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 10876 bytes
SHA-256: 3174d2510b4e4b724dc0a77305e2eeb1693bb3d8f994343823ff06da46d8319f
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1