PDF malware analysis — malicious · f6965f4d99216284

MALICIOUS

PDF

110.5 KB Created: 2021-08-17 14:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7977bdfb30f84b221b1bf017ea30605f SHA-1: 9a1c349639ace6c7147c213e12f688b847110e0b SHA-256: f6965f4d992162845e3bd99f1ec4e9f5cab091f538777a7768c3b0bd8dc31d00

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9842

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://medvor.ru/uplcv?utm_term=integraci%C3%B3n+por+fracciones+parciales+pdf PDF link annotation
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8e3af727---nuxon.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/rebatuxub.pdfIn PDF document text
- http://simonhoirup.dk/userfiles/file/3838153428.pdfIn PDF document text
- https://thietbidiensino.vn/media/ftp/file/vafapas.pdfIn PDF document text
- http://shipsupply.ru/userfiles/files/ripawewo.pdfIn PDF document text
- https://eastmanllc.com/ckfinder/userfiles/files/37585696474.pdfIn PDF document text
- https://tahitotfalu.hu/ckfinder/userfiles/files/sijiso.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/37887652067.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202108/file/39307215918.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/38dcf4d64967ceedebb852ef2952dd21/58184220643.pdfIn PDF document text
- http://mobiliteit.nu/files/7995529624.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999b647319d---75185085145.pdfIn PDF document text
- https://mamap.in/ci/userfiles/files/biruvezalomaxakituguwipo.pdfIn PDF document text
- http://sonntag-immobilien.lu/userfiles/files/furezifikatimik.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/cdfa25997b8570716ad50eb2d54d5efb/vumutoma.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/721b0a999c0b6c789741cd29d0dc81cb/3290984316.pdfIn PDF document text
- http://aktifithalat.com/resimlerfiles/mofomoxeboze.pdfIn PDF document text
- http://dagmar-e.de/userfiles/file/fagupamomowaxizixefiv.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd341s076dqqn1njk8uj93cmhn/menajaluresugobenosivike.pdfIn PDF document text
- http://autoscuolecasetta.it/userfiles/files/fogut.pdfIn PDF document text
- http://angelcabrera.com/FCKfiles/file/30514825563.pdfIn PDF document text
- https://geneticapanama.com/userfiles/file/86637993053.pdfIn PDF document text
- http://kibbkw.com/uploads/file/29247146159.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/fikizobopopawan.pdfIn PDF document text
- http://kovove-ploty-brany-zabradli.cz/UserFiles/File/jizuriwumevamixezidavibe.pdfIn PDF document text
- https://newtech-utm.pl/userfiles/file/52070455884.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_off00013291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13291	10884 bytes
SHA-256: `a292eca21f491fe5d38021cbaa42076b2ac43c2825a5436656b17a6aca9c90c4`
`font_01_sfnt_off00014b63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016375.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16375	18436 bytes
SHA-256: `ee4ca0cecc182b7900ffdaced36e3c08a5af5d112de0f43217334dc22b52aafa`
`font_03_sfnt_off00019383.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19383	16088 bytes
SHA-256: `450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c`

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