PDF malware analysis — malicious · 80e3cb941dab3d26

MALICIOUS

PDF

83.5 KB Created: 2021-07-16 10:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 99edbc97f2e829f737e77abfe40c6ef6 SHA-1: fa7b0b2f26af48e562981cf72b429697f5905424 SHA-256: 80e3cb941dab3d26a8e566a5d17ca33c28b7e77f25b7e1ae21a41d459c8d26b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm, potentially leading to further stages of attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=msva+inspection+manual PDF link annotation
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b585331e---85950748925.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/kafelurorunawenosaja.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/28857636790.pdfIn PDF document text
- http://kosmonautika.ee/ckfinder/userfiles/files/5697252430.pdfIn PDF document text
- http://provia-events.de/pics/fotos/1/file/gidedebomugapit.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ffcd98508257bc22b06dbd3ebbb78a2b/3271159424.pdfIn PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca56cf373---puxukajigomovelekigedugeg.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/samukomorizanosix.pdfIn PDF document text
- http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zagegetujisabepunesesimiv.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i8io0e8sdtf65cjdd9u5thges4/vetesi.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/dedamumiw.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7b58d2dd---jukamokuzefaxunivupage.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f411c914d---5742953927.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1911274882996141319d92b093b2d9d1/71196148819.pdfIn PDF document text
- http://meyergarden.com/ckfinder/userfiles/files/39268651487.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fc8a94ddb8b08844e09fc39dc933a25f/18276624286.pdfIn PDF document text
- http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/rinobowegawiniriwos.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f74512580d699fb1c26328add1e66387/wividodamozujis.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15bd9a3ea---14882167033.pdfIn PDF document text
- https://istanajpdua.com/contents//files/rufosuxigidowitokeronax.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c23f45a6ff19f4f4fe0a35bc1d74dab/saxewipuditanare.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/jabuxojep.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_off0000e346.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE346	10596 bytes
SHA-256: `f21bb0d71a236c96662115b45593c767502be812f905315b30e71b0fca395985`
`font_01_sfnt_off0000fb7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB7F	16936 bytes
SHA-256: `b4f57bdad8c9f89ec3299c3066a933932a4127929f1be71515a3c41b06319dbd`
`font_02_sfnt_off000127a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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