Malicious PDF — malware analysis report

Static analysis result for SHA-256 df778e8c63f4fb35…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 10:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 442977041560dbf50341f4e07ca81880 SHA-1: f4185dcbb73e01ed38a981ec74b16d3239270c3c SHA-256: df778e8c63f4fb3526afe6458ee314e30fb1e2479b8c097d7c1517d2406114f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=ten+minutes+ago+cinderella+sheet+music+pdf PDF link annotation
    • http://austral-immo.com/userfiles/files/84837886509.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/96264478226.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37825620385.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/guxefibegumofev.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/60516999904.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160faedf83f494---97963869026.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/98196633136.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-16/20210616144921313019.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/27319188889.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dfde0b52972---22531105313.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/xinopuk.pdfIn PDF document text
    • http://qdjshg.com/files/file/fegufuxob.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/6964039845.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9198d39329---pigodalulusux.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/74810845191.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/kozoz.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe3e9b9884---wapabopuwarefubebefanejix.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b087a3e8fd7---98205121481.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/xipibivexitarakamuxonus.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/24193558032.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/didomekowisetunebapeg.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ad19a6320e5eb1d298040c5b09919643/29649627855.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/6496548909.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcc3db27d5---10265689799.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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 19696 bytes
SHA-256: f0e21ed034e3375377ee28c682f0e07b8c8f29cf6df01ae8070d05de8ac2629d
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 11132 bytes
SHA-256: 6237d2daaed394c47c7d9e3ac907eb78b328cee1fc0f432aea5a0d107db6f3ba
font_02_sfnt_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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