Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b0f712a578b103…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 08:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f21ce3be9ee3baa7344b46a2416289d4 SHA-1: d140db61800970186157ad36436c8d3d71f15f9c SHA-256: 53b0f712a578b1035ff41053846fd19b4f97ee6422828742ca73995381a320d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malware. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8b9cffa392614f898c24dff789b23507/pojogitivapoxalofofixukid.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee37dd9cc7---zubonetogilunuke.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/1091922021.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613954f924546---96227844049.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/pozafovoxefi.pdfIn PDF document text
    • http://erex.hu/upload/file/46019378145.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/wuruvatoluzunezudawogofar.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/69o1qjeitdembnd796hjec7br6/59824091360.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/26062935736.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907190847.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/23998178412.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/79796456110.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/43162667293.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/70999313862.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/nifatipewugogirivudimodem.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/28470739576.pdfIn PDF document text
    • https://architektor.ru/uploads/file/27047462907.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/57549495955.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/diwulax.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/24202687519.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/vimetipoke.pdfIn PDF document text
    • http://keitbg.com/images/files/66827940831.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/gobaviwuxutexarilelapodi.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xapadiluxegalikofuwalizu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/rididazifesegokomidij.pdfIn PDF document text
    • https://go2germany.ru/files/file/16564403217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=realmcraft+with+skins+export+to+minecraft+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 11208 bytes
SHA-256: fe326a74b7ff76cb48af0636d2885adc00f515681aee3644c04469e459b1b1c9
font_02_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 18772 bytes
SHA-256: 943e15c469629dde9c055c7efed281a0647ef9bd657b0a688bbd4f898d633bc5

Open this report in the interactive analyzer, or submit your own file for analysis.