PDF malware analysis — malicious · 2c0dafbb40c11531

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 02:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 2739779bd1ac6a6603ffed8a964cfc23 SHA-1: fe0ac7c651c59873852e81cc2053c699d5f2dc5d SHA-256: 2c0dafbb40c115313bcb502966bcd372a3167d2dac74378f00da0f76c57a227a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads on disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the T1059.007 technique. The presence of these links suggests a phishing or malware distribution attempt, aligning with the Spearphishing Attachment initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f9ded9a2e---21500689576.pdf In PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4f814020---zijenodizoditumekax.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/50528873662.pdfIn PDF document text
- http://abpaluso.com/upload/file/80474812386.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/30bqpkujfsaaiea8sq5qhqfv4t/pajuv.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8753f9f7---42763517630.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/wodudonedojamejikoniki.pdfIn PDF document text
- http://niezapominajkowo.eu/userfiles/file/geruzupekotepasonufuti.pdfIn PDF document text
- https://livre-art.com/ckfinder/userfiles/files/gisolubagiruxo.pdfIn PDF document text
- http://jocoseatee.com/userfiles/files/vijawebuzitopo.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6cf3013fd41d33e13a5b9ac7a140dce5/jomamapositumeb.pdfIn PDF document text
- https://bnovum.hu/downloads/nibogezoferituwopune.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/tidadu.pdfIn PDF document text
- http://neonatal-surgery.ru/userfiles/files/53132188523.pdfIn PDF document text
- http://hurtglass.pl/upload/file/62959632103.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbbe2b081---giwibuxarimudigejesiwa.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160abc68cf2335---nuradusigiwo.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405741d445---89998194573.pdfIn PDF document text
- http://cissi.it/userfiles/files/jepotikozelozesesepune.pdfIn PDF document text
- http://aunay-sous-auneau.fr/ckfinder/userfiles/files/81997466077.pdfIn PDF document text
- https://tramhuonghanoi.vn/upload/files/37694404635.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/62728f3eb62038ce70079fd1e3ed231e/fagax.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eca6cb9fd---varare.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b73b1d7f9---11341671012.pdfIn PDF document text
- http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/4553361915.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3b08039faaef65542ab72d4e6b9af646/4502423097.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=24+times+tablePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f466.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF466	17204 bytes
SHA-256: `130ae45f1a2a099c47e2d1142baefbd216bfe4b0ed7d323be04626237e01ae6a`
`font_01_sfnt_off00012083.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12083	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001389a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1389A	10188 bytes
SHA-256: `f7ef1b9d96ad66c8128c99621b9ef8ee97a40de27d410c96f42b1541cc728780`

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