PDF malware analysis — malicious · 6d69de68411d7f20

MALICIOUS

PDF

89.2 KB Created: 2021-08-20 15:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 79a9e108bcac1ecaef78a777b6132000 SHA-1: 6b13ef8f710b27dba7501101bc1d359bf1cfaa5e SHA-256: 6d69de68411d7f20f810d86be14562c803240ec26b82264f250c6189f553887a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external sites, including those hosted on compromised CMS uploads, and presents a deceptive download button. The presence of numerous links and the ML classification suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://haki.vn/uploads/files/kafatub.pdf In PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f82803d1998---semone.pdfIn PDF document text
- https://iva-vietnam.com/userfiles/file/dolumoduzasu.pdfIn PDF document text
- http://yetisirkaucuk.com/firma/files/fozoguzopitepoza.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/juncqraki9puh1bannd0kdmgs4/sofojazi.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o6i1e1m7mj40rtrg1907211gm3/zazukarada.pdfIn PDF document text
- https://zevkotodoseme.com/upload/ckfinder/files/lapuvozeximabokedufunor.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c26639ba---dalujafative.pdfIn PDF document text
- https://sssmri.com/ckfinder/userfiles/files/94203763543.pdfIn PDF document text
- https://mimpiindah168.com/contents//files/29974256103.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2794b706c3eb3876492606549f7d5ee2/50147527911.pdfIn PDF document text
- http://prttour.ca/FileData/ckfinder/files/20210604_E6B7D4BD2B555D89.pdfIn PDF document text
- http://leaguengn.com/userfiles/file///31666302619.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077495244a07---57565859260.pdfIn PDF document text
- http://edu-family72.ru/content/images/uploads/file/35218863903.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b2abdc67cb883c00414bca3091c03acb/xezilojejugazemak.pdfIn PDF document text
- http://www.vegagastro.pl/upload/file/99090629150.pdfIn PDF document text
- https://cafe-malaysia.com/contents/file/sewovuramadirigami.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/556006317.pdfIn PDF document text
- https://legouic-peinture.fr/userfiles/file/wutude.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776f83c0ab---48236209577.pdfIn PDF document text
- http://rosniyom.com/userfiles/files/35847678926.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f58c186727d0d0e7ab3c357c5c4006f0/jegurejuluzigonuzali.pdfIn PDF document text
- http://mydreamtuscanwedding.com/editor_up/9812085711.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=praise+and+worship+mix+mp3+downloadPDF 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_off0000e084.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE084	10920 bytes
SHA-256: `da88ccc8db1c3a54d379a532c0c17d33eac20254ea50b016991efe4ec6e15800`
`font_01_sfnt_off0000f99a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF99A	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`
`font_02_sfnt_off00010f15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F15	17988 bytes
SHA-256: `86472b8c9d3d15e9aeb8d018d158a165a8c9d74f5adadb7b05036cabc048ab05`
`font_03_sfnt_off00013dfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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