PDF malware analysis — malicious · a9d56040e5789ae7

MALICIOUS

PDF

91.6 KB Created: 2021-09-22 21:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: c8994855966c8343f34b26cd0176c7f4 SHA-1: 64b8263f24855b70e505ce66bb48902ad290dd4e SHA-256: a9d56040e5789ae7dce0093aaa8c88b735356978113f652d603708d296003036

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URIs and link farm indicators suggest the document's primary purpose is to redirect users to potentially compromised websites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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://cructi.ru/uplcv?utm_term=multiplayer+racing+game+mobile PDF link annotation
- http://sieuthihatgiong.vn/webroot/img/files/zorasusexozujovatadufo.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a8c50443bc6f3cec92ecbf5c65243658/memifujijupefivux.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840912166c---lomegiso.pdfIn PDF document text
- https://activsport.ro/userfiles/file/zenelako.pdfIn PDF document text
- http://getwealthythisyear.com/ckfinder/userfiles/files/68313134333.pdfIn PDF document text
- http://udelimpa.es/ckfinder/userfiles/files/10155479021.pdfIn PDF document text
- https://huaku3c.tw/uploads/files/202109022129276579.pdfIn PDF document text
- https://aneri12.cz/res/file/xibubepuvosaremopogetuse.pdfIn PDF document text
- http://nbmounts.com/userfiles/file/1630981413.pdfIn PDF document text
- https://xn--b8qxb801j.tw/upload/files/tizoturiwudowurojimol.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138709e3d483---80777120060.pdfIn PDF document text
- https://xn--nmqu14inmf.com/upload/files/pisujonazaguxiw.pdfIn PDF document text
- http://www.jokilaaksonratsastajat.fi/file/jirum.pdfIn PDF document text
- http://design-klasse.de/ckfinder/userfiles/files/logujilatoriv.pdfIn PDF document text
- http://cheliabinsk.realxenon.ru/uploads/files/40186377097.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9597601f0ad6dc65abde7cf9c190901c/73493639768.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/15042995956.pdfIn PDF document text
- https://unovosti.tv/ckfinder/userfiles/files/tululefo.pdfIn PDF document text
- https://dananeye.com/uploads/files/202109050533424212.pdfIn PDF document text
- https://elnativocoffee.com/silver/upload/files/kakudokasonaluxa.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff547ecb3c---pufagodetusatat.pdfIn PDF document text
- http://liveranigioielli.it/userfiles/files/38929187358.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/3222933176.pdfIn PDF document text
- http://volker-issmer.de/userfiles/file/95437382457.pdfIn PDF document text
- https://rinducm1.com/contents/files/kitiwojapabivi.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e6d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6D9	17072 bytes
SHA-256: `e818989edf03f333fc4d9c0464985ffb40d7ce9a78d5f37ebf016cf1ecc13ac3`
`font_01_sfnt_off0000ffaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFAF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000117c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117C1	18256 bytes
SHA-256: `c6d2a40e02af0b7b63dc2149125db95750e61537e5bd1e802d5d83834f8e831d`
`font_03_sfnt_off000146dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x146DD	10896 bytes
SHA-256: `4d4492440a8f4b1aa4130d09f9d9ad958c71a5e7fd93fcffc6abb8f956cd4b91`

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