PDF malware analysis — malicious · 54b83c140b828ae3

MALICIOUS

PDF

96.0 KB Created: 2021-09-17 10:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c190ae72b7967b4bdaa315333a984519 SHA-1: d304254ba093d8384926d9509f55cb5f35a25d44 SHA-256: 54b83c140b828ae3662b9bd8f1f2c858f5ed107bfaa5a724b9a17ced620ab1cf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9929

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://krisoc.ru/uplcv?utm_term=cast+my+phone+to+the+screen PDF link annotation
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351cb20233c---pakuvoburiwo.pdfIn PDF document text
- http://ayurveda-shiatsu-nice.com/upload/files/zexofezavoxidorenasidaf.pdfIn PDF document text
- https://egca.fr/userfiles/file/lelozemilomojubesumeles.pdfIn PDF document text
- http://eltprof.ru/userfiles/file/88712739031.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135377d4124d---xowetepibajam.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c13656f3366754e7515425599968893f/xonikitezepekufozid.pdfIn PDF document text
- http://maekuangudomthara.com/ckfinder/userfiles/files/88399566369.pdfIn PDF document text
- https://nacionalequipamentos.com/ckeditor/uploads/files/32759433787.pdfIn PDF document text
- https://whitesal.com/data/images/file/3606_20210907131545.pdfIn PDF document text
- https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/72929754355.pdfIn PDF document text
- http://glampingcaravan.com/userfiles/file/20210905143639.pdfIn PDF document text
- https://rcvizovice.cz/ckfinder/userfiles/files/35592596559.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47e2a2663---kuminigekikuketavowovijeg.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/47674844840.pdfIn PDF document text
- http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewomuzakivu.pdfIn PDF document text
- http://yakutiaprime.ru/SITE/files/editor/file/tosenusoxudigizi.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/74625250402.pdfIn PDF document text
- https://gotoko.com/cmsv2/upload/files/wupixojerelogewiduvokije.pdfIn PDF document text
- http://owv-sad.de/userfiles/files/57726506674.pdfIn PDF document text
- https://digireg.li/upload/80570782837.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/r0v2830rlmsng33tt22n8525jj/16689320829.pdfIn PDF document text
- https://saigonservices.vn/images/uploads/files/rejofagunapafubil.pdfIn PDF document text
- http://livestocktool.com/d/files/fojikukuded.pdfIn PDF document text
- http://gro-felix.si/uploads/wewojasowanita.pdfIn PDF document text
- http://naturalmis.com/userfiles/file/12862644740.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_off00011490.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11490	17916 bytes
SHA-256: `e3a6daeac0236deeeb919d44aa6fe29a8675a421e6ccc89641c5c18ddecf619a`
`font_01_sfnt_off00014266.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14266	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015a7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15A7D	10644 bytes
SHA-256: `e791b4e515570359018f8d4d78bd7495f40e198480dfa09d63a9e459d400c7a6`

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