PDF malware analysis — malicious · b393f88ea49fb4f7

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 04:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 429f0d1baa4d4d4f4991c9c342fa428a SHA-1: 45d0ac017917f92d4ab76ffa356bf0604dce8b43 SHA-256: b393f88ea49fb4f7b52948a8389da8dc989854fc1b75ce71fac9ea6e51e8281f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=apparent+authority+definition+pdf PDF link annotation
- http://dhf-china.com/d/files/rizuwilovaximisixit.pdfIn PDF document text
- https://micsys.in/userfiles/file/wivowufilagapojugajir.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d048965cd4---jaluligexikok.pdfIn PDF document text
- https://beautyreviveshop.com/newerac2c/userfiles/file/90070777278.pdfIn PDF document text
- http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/tutikigub.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/10915460448.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/2348276569.pdfIn PDF document text
- http://mweb.cz/images/file/51940852223.pdfIn PDF document text
- http://mistral-paints.cz/userfiles/files/88821957040.pdfIn PDF document text
- http://purofirstli.net/userfiles/file/pifijip.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ecin7ivb2dvmhf0jkl95k03e74/xuralofezafigoviwe.pdfIn PDF document text
- http://klm-co.ru/foto/ck/files/rozadenemigomopajiparorab.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/dimox.pdfIn PDF document text
- https://manajrgvaaradhi.com/cms-uploads/files/pilorowutifudevupifewiren.pdfIn PDF document text
- https://lanjutpt1.com/contents//files/bituzaxakobo.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd35c594bad30e2ba6ecddb9e63a411d/dasudusimeve.pdfIn PDF document text
- https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/u5ig9ohkf1i3sas2ko9caiupg1/86569758941.pdfIn PDF document text
- https://hung168.tw/UserFiles/files/rarejenudivirewe.pdfIn PDF document text
- http://mamaskitchenorder.com/uploads/files/kejodetadedujatutuwi.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9446503980597290c2d53208a8019ed6/29888270442.pdfIn PDF document text
- http://taitung-house.com/CKEdit/upload/files/fomupokaxaxadaxuvajasoxu.pdfIn PDF document text
- http://www.urbanwaterways.info/files/57423003385.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cac5bf371---bazavetopokurorilufi.pdfIn PDF document text
- http://silesiacapital.eu/data/file/215452844.pdfIn PDF document text
- http://righetti1970.com/clients/872956/File/kiladewufusodaki.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_off0000e8a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000100b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100B9	10576 bytes
SHA-256: `7586c80c54c3636ebf82c2f0a8eff7bb7898d868e2eea1838ee4da571a686083`
`font_02_sfnt_off000118d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118D4	17824 bytes
SHA-256: `4d5b4f8fae202f40d9334a67b4ce5fd1d17c8249360e0ea396c1583d09a21de9`

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