PDF malware analysis — malicious · a935fd75ed0c6368

MALICIOUS

PDF

96.5 KB Created: 2021-09-18 07:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 4dd75c32a53336d006a06b5860653a1e SHA-1: 57478df617f011ce3b5455bef2f5a466baaf237d SHA-256: a935fd75ed0c63689e7f8de4f7badee20c83750f4d6399523a099982d1a2cd41

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external, potentially harmful content, rather than delivering a direct payload within the PDF itself.

Machine Learning

Nyx PDF Classifier malicious score 0.9609

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://0924055971.com/uploads/files/202109100709125971.pdf In PDF document text
- http://chrisdepanneservices.fr/Sites/cds/files/23186400729.pdfIn PDF document text
- http://veterinariogiardinelli.it/userfiles/files/sasasetime.pdfIn PDF document text
- http://stonestudio.pl/files/upload/file/relovenuxu.pdfIn PDF document text
- http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodilir.pdfIn PDF document text
- http://quatanggiabao.com/images/uploads/files/rugozikoxakagipatidejot.pdfIn PDF document text
- https://glaskunstcentrum.nl/images/file/26089928613.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e24f32d9---93628454599.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/14932933512.pdfIn PDF document text
- https://dongciao.com/uploads/files/202109080653004101.pdfIn PDF document text
- https://getadoc.in/ckfinder/userfiles/files/62841680888.pdfIn PDF document text
- http://giovanniseneca.eu/userfiles/files/15681349420.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614007bc7a637---81221681026.pdfIn PDF document text
- http://fructusartis.com/i/File/jododikepak.pdfIn PDF document text
- http://aaas.handyfriendship.com/upload/files/gazeri.pdfIn PDF document text
- https://pre-www.bridge-college.com/uploaded/ckeditor/files/91138804414.pdfIn PDF document text
- https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/puxufepusox.pdfIn PDF document text
- https://hawkseyetravels.com/assets/ckfinder/userfiles/files/27859897268.pdfIn PDF document text
- https://skvacations.com/userfiles/file/mupoka.pdfIn PDF document text
- http://tongkhomica.com/upload/files/vonomopip.pdfIn PDF document text
- http://karthikeyanjayaram.com/userfiles/file/51466155375.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8edc4da009427846f9def82363c2d032/jemigenovugixobodajo.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161451cadf1175---fuxuroxakujikume.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e1cdd523bcfb51b9cf36df44edaa6c28/zekudowebidivazedevirikom.pdfIn PDF document text
- http://westhollywood.ilovepokebar.com/uploads/files/latarotowuj.pdfIn PDF document text
- https://myreply.mobi/snappshott/editor//file/6050072796.pdfIn PDF document text
- http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lusipetibagagodekuliz.pdfIn PDF document text
- https://foundationkuzmanov.com/files/85544173216.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=castleville+legends+for+androidPDF link annotation
- 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e900.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE900	23672 bytes
SHA-256: `4d86e34ec1c247f134563b105f4754843a994e6d8c73f5a6bedf9aa1275022cc`
`font_01_sfnt_off0001244e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1244E	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`
`font_02_sfnt_off00012c4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C4B	10628 bytes
SHA-256: `33d87d6f0ec3e6a20990029953ee51048d02cc31c2f499a7a35d3f93e3ffb426`
`font_03_sfnt_off00014491.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14491	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off00015ca2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15CA2	16244 bytes
SHA-256: `fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d`

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