PDF malware analysis — malicious · e0681766f15d7739

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 02:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: a4e6ec1e929330f456ada8387d433e4c SHA-1: 1669b9ffaa3d22c8d85b486fa38165325d7241a3 SHA-256: e0681766f15d7739be391853f2fa0390525b95c1d1c7a15a1bbc5ed7f5734d37

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

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.
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://laborke.ru/uplcv?utm_term=create+avd+in+android+studio PDF link annotation
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jl6nceir9i2am5i0kq6en19sfv/duburilofajesuvigujojexa.pdfIn PDF document text
- http://www.rupankar.com/fckimages/file/webuvutetigasemawuvo.pdfIn PDF document text
- http://2015.letnifestiwal.pl/ckfinder/userfiles/files/1813267530.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7652ef75a---dafowenokoges.pdfIn PDF document text
- https://fentesmakina.com/paket/upload/files/90253446043.pdfIn PDF document text
- http://hb-hospital.com/file_upload/fck_upfile/file/jusalibiwimalopamoros.pdfIn PDF document text
- https://skywaynepal.com/userfiles/file/pikenetevepimoluvunoxoxeb.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f16049f787d6d2275f676e24a79b21cb/vajebutufoxi.pdfIn PDF document text
- https://magnanerie-cazilhac.com/userfiles/file/fekapezot.pdfIn PDF document text
- https://sofahatinh.com/upload/files/75536796315.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132a79155a8c---kabaxilenev.pdfIn PDF document text
- https://kampusogrenciyurdu.com/file/50436585882.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea0b8d43a---nuvenowevakowu.pdfIn PDF document text
- https://rdsdealers.com/ckfinder/userfiles/files/zugan.pdfIn PDF document text
- http://bassonconsulting.mc/userfiles/file/gulolesu.pdfIn PDF document text
- http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/tegiwilijeserel.pdfIn PDF document text
- http://strandedtattoo.info/file/60094859730.pdfIn PDF document text
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/20345902028.pdfIn PDF document text
- http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/53856144380.pdfIn PDF document text
- http://evergladesharvesting.com/ckfinder/userfiles/files/85879230728.pdfIn PDF document text
- http://kenshopvn.com/uploads/files/bujufogub.pdfIn PDF document text
- http://volkshilfe-vlbg.at/images/content/files/rezavimimiludafiw.pdfIn PDF document text
- https://promobryansk.ru/userfiles/files/58690576975.pdfIn PDF document text
- http://www.atsamuihaus.com/image/upload/File/76263127623.pdfIn PDF document text
- https://pestresolution.pt/site/upload/file/42298520263.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_off0000b6ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cebe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEBE	18012 bytes
SHA-256: `f333b300f22e1bb31955f748ea845ba593104531c2a30b64f2569fca47616bfb`
`font_02_sfnt_off0000fd42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD42	10392 bytes
SHA-256: `bd5f66bc6e6249e45544150ec31932c7caedd53f4104f8bb981e68e4dd0d0693`

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