PDF malware analysis — malicious · 032e7ede9c1f16db

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 08:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 114fbb3913754ada626195e5a3bdcfc4 SHA-1: 670e8516ad47e1d1831dd6f90eceb0ecbee4da09 SHA-256: 032e7ede9c1f16dbbc79d6e615f48ec5e9b26b3c7c573e0059b4f4637b4205fd

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.6535

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://coretry.ru/uplcv?utm_term=how+to+hack+into+snapchat PDF link annotation
- https://krzczonowice.pl/gfx/file/zuwojipoji.pdfIn PDF document text
- https://corumosmanlimakina.com/js/ckfinder/userfiles/files/28904694510.pdfIn PDF document text
- http://www.pethouse.es/ckfinder/userfiles/files/toginolekosesela.pdfIn PDF document text
- http://unseretochter.com/images/file/kuted.pdfIn PDF document text
- http://gemmacapitalgroup.com/foto/file/getoxisijixaxudufa.pdfIn PDF document text
- http://realtor-madrid.com/uploades/fckeditorfile/93046397208.pdfIn PDF document text
- https://duproject.com/uploadEditor/files/togisoz.pdfIn PDF document text
- http://casier-a-bouteilles.fr/file/tigugulobizovafozug.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7110eb461---bekemixidilopo.pdfIn PDF document text
- http://eva.am/files/6120686002e8dc63.pdfIn PDF document text
- http://sewakendragroup.com/userfiles/file/23885253873.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/98935640809.pdfIn PDF document text
- https://askisan.daynexdemo.tk/upload/files/dusuziremejisox.pdfIn PDF document text
- http://gramercygrand.ru/files/file/tidexasezekivawaguduxenir.pdfIn PDF document text
- http://webinaris.eu/ckfinder/userfiles/publics/files/25815752440.pdfIn PDF document text
- https://kueapem.com/contents/files/zidubutudij.pdfIn PDF document text
- http://tumwebthailand.com/ckfinder/userfiles/files/vogogisozadutovame.pdfIn PDF document text
- https://illustrations.noche.fr/images/files/namuz.pdfIn PDF document text
- http://sasmedm.com/www/js/ckfinder/userfiles/files/20536392431.pdfIn PDF document text
- https://zoldlepes.hu/userfiles/file/26406468568.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bad4ed252---limal.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6e60ce66207465580ff28e67061abb19/59950018227.pdfIn 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_off0000af29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF29	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c740.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC740	10364 bytes
SHA-256: `dcb110662dd2715740d53ef2fccfc4a5021831eec811bb7f1bf47aff055e7005`
`font_02_sfnt_off0000deab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEAB	17284 bytes
SHA-256: `6ffae1cd5ebad4d097181c0f5396ee75a7c0fabc4bb52056d4ff4bde6a160aa4`

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