PDF malware analysis — malicious · 543592925d1478de

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 04:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d42cf6708f666579d99774c4ea5f51a9 SHA-1: 5223d3533c61a5be76c5a1bdebb8e80cf6597032 SHA-256: 543592925d1478de59139ae9d5409c615764ad3c32f363d42286ee6992b16cb2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82d9411c50---tasolanususofaramex.pdf In PDF document text
- http://web68s.com/upload/files/97736913241.pdfIn PDF document text
- https://hotelexpert.ro/uploads/files/lokefiputi.pdfIn PDF document text
- https://t2sc.me/userfiles/xomakuledaberijovap.pdfIn PDF document text
- https://soechi.net/userfiles/file/xibobabomagapenuwamutaman.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ec70d01b---87130469646.pdfIn PDF document text
- http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/xudodurodubaso.pdfIn PDF document text
- http://www.giuseppe.ru/ckfinder/userfiles/files/2903672591.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/totemodigotidomi.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a83dd40953---gurovifapimekalematug.pdfIn PDF document text
- http://hzbmsj.net/images/upload/File/68161327304.pdfIn PDF document text
- http://stavo-bazar.cz/userfiles/file/lubotofovizowu.pdfIn PDF document text
- http://stevis.cz/files/file/xamekesatejox.pdfIn PDF document text
- https://grandiosieventinuziali.it/filesUploads/file/739467415.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608765273e91e---91091405823.pdfIn PDF document text
- http://www.aqsclimited.com/EditorImages/file/berifinuvedoxadomager.pdfIn PDF document text
- https://charlesstreetvideo.com/userfiles/file/9166522401.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07936412e4---domajisuxawinexog.pdfIn PDF document text
- https://kingwaterpure.com/ckfinder/userfiles/files/xumenilurul.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5739dcbecf---nabudurosumej.pdfIn PDF document text
- https://ctsgroups.asia/images/file/43793288961.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c2806c15919ffbe75a56383dfd079ff0/53400323263.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuladuzatod.pdfIn PDF document text
- https://0900107678.com/upload/file/fevuxilurawemawofogater.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/926d4d40203161a7609f96f77f0d9a49/52875367214.pdfIn PDF document text
- https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/27374269347.pdfIn PDF document text
- http://atthaya.com/file_media/file_image/file/31694498245.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=leadership+theory+and+practice+5th+edition+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB13	10876 bytes
SHA-256: `c7768114924e092386118862b7f8aa47f7ada3239bb040a7abf2de8b26ed1a12`
`font_01_sfnt_off0000f42e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF42E	16956 bytes
SHA-256: `52c96bce817cf8db5da89d6cb7c43ad6c00894461a95170d93fbac3aa694610b`
`font_02_sfnt_off00012042.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12042	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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