PDF malware analysis — malicious · e3d0b193fcd6e125

MALICIOUS

PDF

84.0 KB Created: 2021-08-06 07:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ac1feae40d8cb8e0efe8b62631fe5d30 SHA-1: e62907ba6a81274bb5685e71ed67b39b363db9f3 SHA-256: e3d0b193fcd6e125e19ce26a204060cf4c23e2eb0e743cc90e2cb74f4c0c3e7e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://garglob.ru/uplcv?utm_term=free+elapsed+time+worksheets+grade+3 PDF link annotation
- https://nsck-cykelmotion.dk/ckfinder/userfiles/files/wuxolixasudo.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8152c577c---rudilezojebadizumole.pdfIn PDF document text
- https://infotechsystemsonline.com/ital/www/img/file/56226919681.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5f612f09d5e789600ff3dde488f58ae9/59559455835.pdfIn PDF document text
- http://xn--k1akb4c.xn--p1ai/userfiles/file/weduletimewoguli.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f627ca95---jadokuwewajogeg.pdfIn PDF document text
- https://totalmediasolutions.ae/ckfinder/userfiles/files/tekedadawabita.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ba94e661---40241503540.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/iqqv6u2i96kl35chupnlf1v477/10206482995.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f4b2f5bc---79887667881.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/88177313533.pdfIn PDF document text
- http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/luziwozifi.pdfIn PDF document text
- https://zemiigori.com/uploads/file/89370785079.pdfIn PDF document text
- http://banglatalkies.com/dynamic-images/cms/file/74517570358.pdfIn PDF document text
- https://quangcaowebsite.vn/uploads/files/kugunimago.pdfIn PDF document text
- http://manavpublicschool.org/manav/userfiles/file/68294944553.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pvdfjkp0mrvqce9sm439mj33mf/68305475874.pdfIn PDF document text
- http://aromaonly1.com/yamituki-n/uploads/files/57301444228.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/62721b7e52369f6bacc702a6e1c18daf/86178894744.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37076b8a7a---ludok.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b8b4e630f58b02348f8a1e3c812cd908/83961467040.pdfIn PDF document text
- http://koreadramatour.com/FileData/ckfinder/files/20210625_DCC20BE11BA2E401.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0b1743f8---85812921861.pdfIn PDF document text
- https://venusnvs.com/userfiles/file/nulizitupipolonejidopam.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db878829d61---berekedize.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///ziwusitomifejodufa.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a34327f2164838732ed22d058f315064/jixirekaroxilofawodobog.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5128a2788e---84002706399.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e36c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE36C	16576 bytes
SHA-256: `104ab0d63c903690227b7048990cc9da45a9be82b5251caa6eeb3ca7594a5c19`
`font_01_sfnt_off00010e8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E8F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126A6	11060 bytes
SHA-256: `468647b30c5ec863fc0a1a4bff6eb442434916522efda381a0d542d7895371ea`

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