PDF malware analysis — malicious · a20c85e7a63f663e

MALICIOUS

PDF

98.4 KB Created: 2021-08-15 13:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 02915f8eccd6105b671d2161ca6bdfab SHA-1: d8f909c23fd7f8efa7c90dc5a5e14ac2b27fe1e8 SHA-256: a20c85e7a63f663ee84571bb9ef236d7327ecf77fd2ed016a05f90a4b0ccf6cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://tedvandergulik.nl/userimages/file/rusujujopubejomaj.pdf In PDF document text
- https://hyosungulf.com/uploads/file/tikajurejurudotelo.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0724cf8d255b088bf592b3da9ac050dd/67262864609.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/l0p3dvj8c4u63guuer8jv39pf4/17389002960.pdfIn PDF document text
- http://studiosimonepantaleo.it/userfiles/files/xixilejemi.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4e02bee25bc0f84da7bfbf4d4ec4f3d7/97317266469.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f7fb9ddea157dfd5ed2eef35119f6a1e/27292671343.pdfIn PDF document text
- https://egokituz.org/files/galeria/files/91774635845.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/95933621747.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d62e90f354b---86566465733.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/18f0599a9436d733629de0eb1fac1615/74477922053.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefe786907---6709559529.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fcc181d22---lijib.pdfIn PDF document text
- http://tingchucontrol.com/Uploadfiles/files/78478705157.pdfIn PDF document text
- http://tbff-bygg.se/img/files/kilokora.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b204fe70eac---4316025636.pdfIn PDF document text
- https://huaku3c.tw/uploads/files/202108141110254467.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4eef54cc8b898f77ccde6bd62baa2a69/wawidinemotetigapo.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef8faa15a3---55226112033.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ce6281e0---xutisewanozomusa.pdfIn PDF document text
- http://area100impianti.it/userfiles/files/30730821150.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/41023040666.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161186c0430e71---fuwimenusovadiferujof.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160766f9f1a2ab---4010326384.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+your+own+fnaf+modelPDF 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_off00011a1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A1E	17932 bytes
SHA-256: `c128f52bfec783596a9a00863c2927c21f924450808c48fbd02af5ca56f089cd`
`font_01_sfnt_off0001496a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1496A	10636 bytes
SHA-256: `c1452b551ee63f1d3c083eb89550d841cc021eeca64d6ecc5e57ac02b51149d8`
`font_02_sfnt_off000161c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x161C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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