PDF malware analysis — malicious · 401b75d71cfd9a1e

MALICIOUS

PDF

107.9 KB Created: 2021-07-07 01:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: b6da076160fc69565add2e312d69c6d6 SHA-1: 25d2b1745b4c76ece3ff700742272a5d0abf8222 SHA-256: 401b75d71cfd9a1eb0a86ad78f640d1eec9a70c13a62972d567785b90e9fa25f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to WordPress sites utilizing the Formcraft plugin for file uploads, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b229d619d4---wezanovixikudowi.pdf In PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c65d7ee02---44914600123.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed426b0a6---15353251342.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/res6k1od9dshl40ihm95nesii1/tapevokefumosegafati.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f179acff---vaxodiwijolorasupelar.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b28bac4d6---28025647664.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608700974595a---6130179356.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/5d6d46f909213931f86029963ccbb506/dosadogexe.pdfIn PDF document text
- https://thaihoanghung.com/upload/files/34668880099.pdfIn PDF document text
- https://sonntag-immobilien.lu/userfiles/files/64901408490.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ulg4tuuttb0pihoetjunhagm5u/25752224055.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5645f04f---2210177414.pdfIn PDF document text
- https://raljob.com/userfiles/file/vedidame.pdfIn PDF document text
- http://studiosaletta.it/userfiles/files/xesazobivasuraponod.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2303290dd---25113161588.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/71227973533.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608753cfb7f06---80619974291.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c364e9a4358---20387849547.pdfIn PDF document text
- https://bayihoki99.com/contents//files/zibidozipifamem.pdfIn PDF document text
- http://zh-huaxun.com/uploadfiles/files/5182995907.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1dd0e2c65beca440b440c2bbdc06fd54/xotiwolasusuwi.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.org/upload/files/levojegifugigaxenunexar.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=linux+objective+questions+and+answers+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000127dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127DD	18720 bytes
SHA-256: `8ab666a7e011c45f004abd1ac1a5aaba8607943551a9b73db216a2ab8041b172`
`font_01_sfnt_off000159a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x159A9	11296 bytes
SHA-256: `c903b249db629ff4a22889326ff67cc471f8e4b628d5d3af499e81239dbec2bc`
`font_02_sfnt_off000173fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x173FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00018c0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C0F	16340 bytes
SHA-256: `88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15`

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