PDF malware analysis — malicious · bb5a4e6375e24eae

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 06:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 14a678603ba7f16b986ecad7a23ef74c SHA-1: 7710829518e75dea8e4c3159b0bfbbaf53f921fa SHA-256: bb5a4e6375e24eae914dddd9699de13f884f4fd590b1db6fce4e1a9ec10b7791

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The presence of embedded JavaScript suggests it may be used to further obfuscate or directly facilitate the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://pixomot.ru/uplcv?utm_term=how+to+get+free+robux+2021+june PDF link annotation
- https://nhatthiengroup.com/files/uploaded/files/runugadaxikakupakixezus.pdfIn PDF document text
- https://aahs.givingplan.net/sites/default/files/editor/file/96847511880.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423778c8235---zajixewam.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9f2a74224f133f032cd575cebc7bf457/93851019963.pdfIn PDF document text
- https://0924055971.com/uploads/files/202109051131546160.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/62798334901.pdfIn PDF document text
- http://tangiahoang.vn/Images_upload/files/24169828650.pdfIn PDF document text
- http://idolyokocho.com/js/ckfinder/userfiles/files/kipuxulovaxuxawuwolosu.pdfIn PDF document text
- http://edilcfcostruzioni.com/userfiles/files/50414240268.pdfIn PDF document text
- http://alltimescare.com/attachment/files/jezozumiviwexis.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614927ef49856---fenulunuxizu.pdfIn PDF document text
- http://agmapure.com/upload/files/bukifojofab.pdfIn PDF document text
- http://ngocvietbungalow.com/upload/files/tituwixodizavapavub.pdfIn PDF document text
- https://nusbetaja2.com/contents/files/zikiridotugitesubise.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d6a0cb128ce50f3910483da33148b4a1/34712483922.pdfIn PDF document text
- https://2b3la571ga-70p.com/contents/files/27768248134.pdfIn PDF document text
- https://people11people.com/uploads/File/73516622490.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/313c7d9e650f09a55dfb2892552ca06a/sosutimetijajubo.pdfIn PDF document text
- https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/54475799362.pdfIn PDF document text
- http://ukrfirework.com/images/file/5608205119.pdfIn PDF document text
- http://bycongroup.com/UserFiles/file/40476767457.pdfIn PDF document text
- http://energy-labels.nl/userfiles/file/5463676980.pdfIn PDF document text
- https://bywuf.org/upload/editor/files/49784743747.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/furizezejazowak.pdfIn PDF document text
- 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_off0000b0e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0E4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c8fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8FB	10764 bytes
SHA-256: `48016f2578ba7379044098554a96f1de5c37acb771cc6c0c09ec1324503164df`
`font_02_sfnt_off0000e209.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE209	16188 bytes
SHA-256: `e6dddd18d233e2bda138bf22d4998254af8daaa8127a23cef09c469df136d7bf`

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