PDF malware analysis — malicious · bc270b9ff4716159

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7803b3011145837109afd60307b69251 SHA-1: f7b560256ff312264b92b4f3c2f0d98c964727d6 SHA-256: bc270b9ff471615952c62ab7fbe34923e0f3ea957642d084cbb0e067cfa8a2db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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 http://smartvoicecom.com/userfiles/losobejo.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3fa81b5f---nojavupewawovubizuma.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdb5dacab---tixutikobapapaj.pdfIn PDF document text
- https://floridainvestment.cz/files/file/71548695980.pdfIn PDF document text
- http://naturalmis.com/userfiles/file/pepudupisexesoserutenirur.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63a9eb34---13037732666.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/70695993880.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca4a07421---gejotij.pdfIn PDF document text
- http://ksmt.edu.np/assets/ckfinder/userfiles/files/bulasakufaberalomudepugo.pdfIn PDF document text
- https://vico-immobilien.com/ckfinder/userfiles/files/faroj.pdfIn PDF document text
- https://jpjplumbingandheating.com/FCKeditor/file/96402098596.pdfIn PDF document text
- https://ekoelprom.pl/public/images/editor/file/10536313389.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d7b7cd05a---40248221228.pdfIn PDF document text
- http://originalcheck.it/public/img_admin/file///gekiteribu.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b46222aa9---liribawu.pdfIn PDF document text
- http://myphamlulanjina.com/upload/files/vikoposonabemalatokoxisi.pdfIn PDF document text
- https://hutechsolar.com/upload/user_upload/files/60835761495.pdfIn PDF document text
- http://clubesquilacoma.com/uploads/files/mofufenafemu.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607283b293814---dotagitegub.pdfIn PDF document text
- https://manpowernepal.net/ckfinder/userfiles/files/gurufabokidezabavip.pdfIn PDF document text
- https://ketdoanbus.com/webroot/img/files/samoduv.pdfIn PDF document text
- https://baongochoa.com/upload/file/82117601924.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210623_1405C918EBE747D6.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3210554c41b31369917f59c8e6ad6040/81411241752.pdfIn PDF document text
- http://sunnyten.net/userData/board/file/lumulesabuguvamejefofarar.pdfIn PDF document text
- https://medicentrumnz.eu/medicentrum/files/file/mikagakaxufaxev.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=osho+dhyan+sutra+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bd39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD39	18952 bytes
SHA-256: `e37b7b32974c88fcbc4d94894b67faa8c740ed6851b5b01a58ba49eecd62bbed`
`font_01_sfnt_off0000ebf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBF4	10564 bytes
SHA-256: `ea9b07a998b71560584ec9b377320ac065a32546679953e32ad8e8d515eba9e5`
`font_02_sfnt_off00010407.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10407	16104 bytes
SHA-256: `4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7`
`font_03_sfnt_off00011952.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11952	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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