PDF malware analysis — malicious · 78e62b576ff4ca80

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 12:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b2030270aca0d81a65893619c12f8800 SHA-1: e100e1ee9dad1148f174891d122913effb5be9a6 SHA-256: 78e62b576ff4ca80d72d61cf0e4f0ad44c4afa213a8d0ef93f2fc20b280dbaf3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the extensive link farm suggests a social engineering or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=gta+5+beta+version+apk PDF link annotation
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/12f384686a75fe3b119408a5faf46c76/38039151762.pdfIn PDF document text
- http://minhledtran.com/luutru/files/26424066691.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d058a435c2---39730974942.pdfIn PDF document text
- http://abwpetersburg.com/uploads/files/mufonafevubilegilotazev.pdfIn PDF document text
- https://copab.tn/216mag.svn/uploads/files/nawexofubowojogoxe.pdfIn PDF document text
- http://asesoriazabalburu.org/azaba/files/file/lomobane.pdfIn PDF document text
- https://marljivo.hr/userfiles/file/90569353649.pdfIn PDF document text
- http://dsagco.com/Upload/file/vavema.pdfIn PDF document text
- https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/47741482363.pdfIn PDF document text
- http://marktoby.com/akram/know_news/admin/userfiles/file/xusefudifijifi.pdfIn PDF document text
- http://villahetzwartepaard.nl/survey/userfiles/files/tolusumujorolo.pdfIn PDF document text
- http://elliptical-trainers.ru/ckfinder/userfiles/files/poziwikokabobido.pdfIn PDF document text
- http://salamino.pl/userfiles/file/debawijedod.pdfIn PDF document text
- https://led7.ru/file/87675016346.pdfIn PDF document text
- https://viessmannboilers.ca/fck_upload/file/fekugibas.pdfIn PDF document text
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/negemadomobalibogexitanod.pdfIn PDF document text
- http://gr-chem.com/upload/files/53040158164.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7308dc1d---69038779847.pdfIn PDF document text
- https://ispartaprefabrik.com/ckfinder/upload/files/tixufofewojidetomid.pdfIn PDF document text
- http://serramentisiciliano.it/userfiles/files/37161000361.pdfIn PDF document text
- http://thuocamakong.net/userfiles/image/file/sebitupowosewofemuge.pdfIn PDF document text
- http://rydelko.eu/userfiles/file/94601328673.pdfIn PDF document text
- https://allmassage.net/upload/file/20210913042145.pdfIn PDF document text
- http://luchetti.it/userfiles/files/16655948760.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d18fa03---wozomilifepuvamobelenifug.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_off0000d58a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD58A	17580 bytes
SHA-256: `2fbf05e552726edc40e046f9cf168153db51aa314c072664f35543d7bb687f64`
`font_01_sfnt_off00010353.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10353	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B6A	10672 bytes
SHA-256: `4111c1fa55f89b2440c6d358d440f0ca99c433ea1413284a5062f8a6cd6abb19`

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