PDF malware analysis — malicious · 829e2538020643e9

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 12:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 3e02afce42ccfca71b32411f45f82604 SHA-1: bf0a9e41c105f86f847ff96e64972fe7526b2aa7 SHA-256: 829e2538020643e9806585f154df5e3247b1795dd1f8af2d9a7a64a0e2b44590

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055 Process Injection

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fe69d2e7---47661959314.pdf In PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/29ef166130ef399308a579d27f4ff87c/56360805510.pdfIn PDF document text
- https://signatureshreyas.in/userfiles/file/vuguwezilijereburimik.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86c864eb76c4ad910d9044df6e4bc56d/78645335236.pdfIn PDF document text
- http://idealthailand.com/file_media/file_image/file/29047867573.pdfIn PDF document text
- http://studiosiciliani.eu/userfiles/files/51877145851.pdfIn PDF document text
- http://www.casasemio.com.br/ckfinder/userfiles/files/64808704497.pdfIn PDF document text
- http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27599111573.pdfIn PDF document text
- http://podarox.ru/public/files/63429253580.pdfIn PDF document text
- http://sinostandards.net/upload/files/4104648665.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed52058a54---84080759773.pdfIn PDF document text
- http://hueide.com/upload/files/95888406292.pdfIn PDF document text
- https://www.pirkitpadangas.lt/ckfinder/userfiles/files/gumowu.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613221cecb1fb---1085748537.pdfIn PDF document text
- http://thebookmarkcafe.com/uploads/files/33541144182.pdfIn PDF document text
- https://northwestconvention.cz/data/files/wewonowomadodemem.pdfIn PDF document text
- http://koyomisushi.com/uploads/files/wedaluvebetozekusipa.pdfIn PDF document text
- http://www.premiumimport.nl/ckfinder/userfiles/files/94268721508.pdfIn PDF document text
- https://himalmanpower.com/ckfinder/userfiles/files/vobatobezobon.pdfIn PDF document text
- http://webinaris.org/ckfinder/userfiles/publics/files/38418030917.pdfIn PDF document text
- https://client-sms.com/ckfinder/userfiles/files/regozokifebonomabepabixo.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0cde09f6755a1dc49a6ac0244ff9831b/62676986127.pdfIn PDF document text
- https://atlantidegattico.it/file/wigajebiginarew.pdfIn PDF document text
- http://jingyitech.com/uploadfile/kapamapibofagesoxod.pdfIn PDF document text
- https://szalkasszorutacskok.hu/app/webroot/files/content/files/64191690798.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+emulator+for+core+i3PDF 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_off0000dd53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD53	10964 bytes
SHA-256: `acc824d25f4222fc4ab9e8f151b04ee704f289eb4ce3e96c6fa9796aa677af47`
`font_01_sfnt_off0000f6d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6D0	16932 bytes
SHA-256: `f3129494352625490b26bf4ea3f2a4a8af26f37a63b795fdd1ab5eb607a1566e`
`font_02_sfnt_off00012295.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12295	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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